221 results on '"Fish biodiversity"'
Search Results
2. Potential Impact of DOM on Fish Biodiversity in the Jinshui River Basin Environment.
- Author
-
Cheng, Shoutao, Zhang, Jiasheng, Xue, Hao, Yang, Qi, Liu, Jing, Zhang, Lingsong, Liu, Na, Wang, Yeyao, and Meng, Fansheng
- Subjects
- *
DISSOLVED organic matter , *WATER quality monitoring , *ENVIRONMENTAL health , *BIODIVERSITY monitoring , *FISH diversity - Abstract
Water quality is crucial for the ecological health of rivers. However, assessing environmental stressors in large river basins has been challenging due to limited biodiversity monitoring tools. Combining environmental DNA and water quality monitoring presents new possibilities for evaluating the impact of dissolved organic matter (DOM) on fish diversity. Case studies from the Jinshui River, Futou Lake, and Gan River in the Jinshui River Basin demonstrated that eDNA biomonitoring reached 84.62% OTU asymptote (176 OTUs) and 91.06% species asymptote (49 species). The Gan River had 1.21 and 1.26 times more fish OTUs than Futou Lake and the Jinshui River, with 20 overlapping species among the areas. We identified typical excitation-emission matrix (EEM) components of DOM and three PARAFAC fluorescent components: C1 (microbial humic-like), C2 (terrestrial humic-like), and C3 (tryptophan-like). Sequence diversity was positively correlated with EC, TDS, pH, NH3-N, DO, CODMn, biological index (BIX), and freshness index (β/α). Taxonomic diversity positively correlated with spectral slope ratio (SR) and C3. Functional diversity positively correlated with SR but negatively correlated with humification index (HIX). The combined eDNA and DOM monitoring approach shows promise for future assessments of fish biodiversity in river basin environments. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
Catalog
3. Evaluation of Fish Biodiversity in Estuaries Through Environmental DNA Metabarcoding: A Comprehensive Review.
- Author
-
Alenzi, Asma Massad
- Subjects
- *
GENETIC markers , *ENDANGERED species , *GENETIC barcoding , *ESTUARINE fishes , *ESTUARIES - Abstract
Traditional methods face difficulties in capturing elusive species and navigating the complexities of estuarine environments. The adoption of eDNA metabarcoding has revolutionized biodiversity assessment, offering non-invasive and comprehensive sampling. Challenges specific to estuaries, such as sediment loads and salinity fluctuations, were initially addressed through improved DNA extraction, optimized primers, and specialized bioinformatics tools. The integration of multiple genetic markers and quantitative eDNA approaches has enhanced resolution, enabling the detection of rare and cryptic species. Standardized sampling protocols and validation through traditional methods contribute to the reliability of eDNA metabarcoding. This technology holds promise for informing conservation and management strategies in estuarine ecosystems by providing timely and cost-effective biodiversity data. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
4. Detour canal, a civil engineering heritage created through historical struggle for water resources, now provides the habitats for a rare freshwater fish.
- Author
-
Yohei Yamasaki, Hironori Hayashi, Suguru Kubo, Takashi Namiki, and Yuichi Kano
- Subjects
CIVIL engineering ,WATER supply ,FRESHWATER fishes ,SPECIES diversity ,SPECIES distribution - Abstract
The Ariake catfish, Tachysurus aurantiacus, is a freshwater fish endemic to Kyushu Island, Japan. However, these catfish are now endangered owing to environmental changes. Despite their status, there is scant quantitative research on the Ariake catfish regarding their potential conservation. The Yabe River is a typical catfish habitat situated in the northern part of Kyushu Island (Ariake Area) and has a unique civil engineering heritage, as represented by the so-called 'detour canal'. The canals were created owing to competition by two Domains to divert additional water resources into their own territory for rice cultivation during the Edo Period (1603-1867). To fill the research gap on the Ariake catfish and assess the ecological value of detour canals, in this study, we conducted a survey of local catfish populations and nine environmental parameters that can affect them. We found that the population volume of the Ariake catfish was significantly higher in canals than in ordinary branch rivers. Although the detour canals were not originally constructed for biodiversity conservation, they nonetheless unintentionally provide catfish habitat at present. As these canals represent a remarkable example of a contribution by a civil engineering heritage structure to biodiversity conservation, our study should be used as a potential justification for preserving the canals, as well as conserving the aquatic species that utilise them as vital habitat. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
5. Decadal‐scale regional variability in monitoring efforts significantly influences fish diversity trends in the Euphrates and Tigris catchments, Türkiye.
- Author
-
Bayçelebi, Esra, Kaya, Cüneyt, Kurtul, Irmak, Turan, Davut, Haubrock, Phillip Joschka, Soto, Ismael, Aksu, Sadi, and Tarkan, Ali Serhan
- Subjects
FISH diversity ,SPECIES diversity ,BIOLOGICAL extinction ,ENVIRONMENTAL degradation ,SPECIES distribution ,WATERSHEDS - Abstract
This study investigates the temporal and spatial distribution of species richness in the Turkish portions of the Euphrates and Tigris catchments in Mesopotamia, aiming to identify areas lacking sufficient research and inform future conservation and management efforts.Data from 153 fish assemblages in the Euphrates catchment and 100 in the Tigris catchment, spanning from 1941 to 2022, were analysed using a combination of analytical occurrence, spatial and space‐for‐time mixed effect models.Results indicate an increase in reported species over time, attributed to heightened sampling efforts, and reveal significant differences in spatial species richness distribution influenced by uneven sampling and environmental suitability.Identification of areas with insufficient research, potential undetected species and biodiversity losses highlights the need for improved assessments to prevent unnoticed biodiversity loss and ecosystem degradation.Our results emphasize the importance of accurate biodiversity assessments for effective conservation and management interventions in these catchments. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
6. Indigenous Small Fish (ISFs) Diversity of the Northeast Region of India and Its Economic Importance
- Author
-
Chetia Borah, Bibha, Bordoloi, Biswajyoti, Sinha, Archana, editor, Roy, Aparna, editor, and Gogoi, Pranab, editor
- Published
- 2024
- Full Text
- View/download PDF
7. Taxonomic and functional diversities reveal different fish assemblage dynamics of stow net fishery in Haizhou Bay
- Author
-
Guangjie Fang, Yazhou Zhang, Haolin Yu, Chuanxi Chen, Jun Liang, and Yanli Tang
- Subjects
Fish biodiversity ,Traits ,Functional redundancy ,Fishery management ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Biodiversity is the cornerstone of marine fisheries. To ensure the prosperity of stow net fishery in Haizhou Bay, regular investigations of fishery resources are essential. However, most studies have primarily focused on taxonomic diversity while overlooking functional diversity. In this study, we examined both the taxonomic and functional diversity of fish assemblages based on abundance and functional traits from 2013 to 2018. Significant differences in taxonomic diversity were observed only between two seasons, whereas functional diversity showed significant differences across years, seasons and groups. Diversity indices exhibited negative linear relationships with catch per unit effort, except for functional evenness (FEve) and functional divergence. Twenty-seven out of 30 correlations between the two types of diversity indices were predominantly positive and synclastic, whether linear or nonlinear. Functional dispersion showed the most positive relationships with taxonomic diversities, while FEve exhibited gentle slopes. The functional redundancy curves indicated that the ecological stability and resilience of fish assemblages were vulnerable. The non-target fish group demonstrated a higher overlap in functions compared to the target fish group and the total fish group. In summary, the taxonomic and functional diversities revealed inconsistent statuses and trends of fish assemblages, with an evident decreasing trend in the non-target fish group requiring special attention. This study highlights that both taxonomic and functional diversity should be considered simultaneously in fish biodiversity investigations, which is crucial for establishing effective fish conservation systems. more...
- Published
- 2024
- Full Text
- View/download PDF
8. DNA barcoding of fish diversity from Batanghari River, Jambi, Indonesia
- Author
-
Huria Marnis, Khairul Syahputra, Jadmiko Darmawan, Dwi Febrianti, Evi Tahapari, Sekar Larashati, Bambang Iswanto, Erma Primanita Hayuningtyas Primanita, Mochamad Syaifudin, and Arsad Tirta Subangkit
- Subjects
Batanghari River ,Biodiversity ,DNA barcoding ,Fish biodiversity ,Aquaculture. Fisheries. Angling ,SH1-691 - Abstract
Global climate change, followed by an increase in anthropogenic activities in aquatic ecosystems, and species invasions, has resulted in a decline in aquatic organism biodiversity. The Batanghari River, Sumatra’s longest river, is polluted by mercury-containing illegal gold mining waste (PETI), industrial pollution, and domestic waste. Several studies have provided evidence suggesting a decline in fish biodiversity within the Batanghari River. However, a comprehensive evaluation of the present status of biodiversity in this river is currently lacking. The species under investigation were identified through various molecular-based identification methods, as well as morphological identification, which involved the use of neighbor-joining (NJ) trees. All collected specimens were initially identified using morphological techniques and subsequently confirmed with molecular barcoding analysis. Morphological and DNA barcoding identification categorized all specimens (1,692) into 36 species, 30 genera and 16 families, representing five orders. A total of 36 DNA barcodes were generated from 30 genera using a 650-bp-long fragment of the mitochondrial cytochrome oxidase subunit I (COI) gene. Based on the Kimura two-parameter model (K2P), The minimum and maximum genetic divergences based on K2P distance were 0.003 and 0.331, respectively, and the average genetic divergence within genera, families, and orders was 0.05, 0.12, 0.16 respectively. In addition, the average interspecific distance was approximately 2.17 times higher than the mean intraspecific distance. Our results showed that the COI barcode enabled accurate fish species identification in the Batanghari River. Furthermore, the present work will establish a comprehensive DNA barcode library for freshwater fishes along Batanghari River and be significantly useful in future efforts to monitor, conserve, and manage fisheries in Indonesia. more...
- Published
- 2024
- Full Text
- View/download PDF
9. Assessment of Fish Species Biodiversity in the Yong River Basin Based on Environmental DNA Metabarcoding
- Author
-
Shengming Deng, Bai-an Lin, Yan Luo, Xiaolong Dang, Chengdan Ma, Yongcan Zhou, Xiang Zhang, Yang Zhang, Ning Xu, Shousong Jiang, Jiana Li, and Jianlong Li
- Subjects
the Yong River basin ,eDNA metabarcoding ,freshwater ,fish monitoring ,fish biodiversity ,habitat type ,Biology (General) ,QH301-705.5 - Abstract
Fish in the Yong River basin have been significantly impacted by pollution, habitat modification and overfishing. In order to facilitate the recovery of freshwater biodiversity, a fishing ban has been implemented in the Yong River basin since 2022. However, the high level of human activity along the waterways of the Yong River basin poses a significant challenge to the monitoring of fish biodiversity using established methods. It is essential, therefore, to have effective monitoring tools to assess the effectiveness of the fishing ban policy. In this study, environmental DNA (eDNA) metabarcoding was employed to assess fish species biodiversity across five river sections of the Yong River basin in October 2022. Additionally, we checked the results against fishing gear (drift gillnets and ground cages) surveys and historical records. A total of twenty-two fish species were found from eDNA metabarcoding, fourteen species were found via fishing, and only two species were found from both methods. The most dominant fish species identified by eDNA was Alburnus mossulensis, present in all river sections. However, a decline in species biodiversity was observed in the whole Yong River basin, with a significant difference in community composition across the Upper Yao River (UYAR) and Yong River (YOR). Moreover, eDNA detected fish and potentially invasive species consistent with their geographic distribution. Overall, the results of this study provide a snapshot of the current fish biodiversity in the Yong River basin, offering baseline data for future evaluations of fishing ban policies in this ecosystem. more...
- Published
- 2025
- Full Text
- View/download PDF
10. Characterization of Fish Spawning Grounds near the Likouala-Aux-Herbes River, Lac Tele Community Reserve (LTCR), Republic of Congo, for Sustainable Wetland Management.
- Author
-
Ndzana Biloa, Eric Bertin, Mamonekene, Victor, and Micha, Jean-Claude
- Abstract
A land use analysis of Lac Télé Community Reserve (LTCR) using the Landsat Thematic Mapper (TM), ETM+ images (Enhance Thematic Mapper), and OLI images highlighted significant changes in plant cover between 1986, 1999, and 2019. The rate of forest area increased by 5% from 1986 to 1999 but decreased by 3% from 1999 to 2019 for the entire LTCR, benefitting the growth of savannahs, which respectively increased by 5% between 1986 to 1999 and 12% between 1999 to 2019. The conversion of this forest area to savannah due to the practice of slash and burn agriculture can be justified by the opening of this forest area, but it contributes greatly to the degradation of fish species spawning grounds in the Likouala-aux-Herbes River. According to characterization of the 151 spawning grounds identified, the physical and chemical water parameters, which have been defined as temperature (28.13 °C), hydrogen potential (4.23), and depth (3.34), did not change significantly in the study villages between July and September 2019. The unregistered ichthyological diversity observed during the study in the seven pilot villages, is due to the diversity of the microhabitats noted in the villages of the LTCR, especially in the villages of Botongo, Mossengue, and Bouanela, where the indices of ichthyological diversity were the highest. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
11. Assessing the Coral Reef Fish Biodiversity in the Al-Wajh Region of the Northern Red Sea, Saudi Arabia.
- Author
-
Alsaaq, Faisal
- Abstract
This study presents the current status of coral reef fish biodiversity in the Al-Wajh region, focusing on both near shore and offshore areas. A comprehensive survey was conducted at 30 different stations, encompassing coastal and offshore locations. A total of 117 fish species belonging to 31 families were identified during the survey, with an overall abundance of 20,810 individuals observed. The fish assemblages in the area exhibited a balanced representation by all functional groups across different trophic levels, indicating a healthy state. Of particular interest were the families Chaetodontidae (butterfly fishes) and Serranidae (Groupers), known as reliable indicators of reef health and effective predators, respectively, as they were adequately represented. The family Labridae exhibited the highest number of species (16), followed by Scaridae (13). Overall, the assessment revealed the healthy nature of the Al-Wajh region in terms of fish stock, providing valuable insights for conservation and management efforts. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
12. An assessment of demersal fisheries by trawling in less than 50 m of water off Egypt's Mediterranean coast.
- Author
-
Shalloof, Kariman, El- Far, Alaa, Desouky, Mohammed G., Fetouh, Mohamed A, Osman, Hanan, Shaaban, Amgad, Saber, Mahmoud A., Ahmed, Ayman S., Maaty, Mahmoud, Makkey, Ahmed F., Abdelsattar, Lydia E., and Aly, Walid more...
- Abstract
Trawl fishing is identified as one of the most significant factors that could affect the diversity of demersal fish groups but not for all depth strata. Since the increased exploitation of Non-Indigenous Species (NIS) has caused the trawl fishing grounds to shift towards shallower seas where their biomass density is maximum, this study aimed to assess demersal fisheries by bottom trawls in the Mediterranean water off Egypt at depths less than 50 m. In this study, data from eight bottom-trawl hauls were used to describe the diversity of the demersal fish catch. The hauls varied in their species composition and both in the number and the weight of individuals. The length frequency distribution of the most occurred species was studied. A total of 87 species were identified in the catch, out of which 32 were recognized as NIS. The percentages of most of the NIS decreased from the east to the west of the surveyed area. There are always changes in fish diversity because of increasing fishing efforts on demersal fish communities, but not for all depth strata, therefore, a monitoring program has to be designed for better assessment of fisheries resources in the Mediterranean water off Egypt. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
13. A Comparative Evaluation of eDNA Metabarcoding Primers in Fish Community Monitoring in the East Lake.
- Author
-
Li, Yiwen, Tang, Minzhe, Lu, Suxiang, Zhang, Xiaochun, Fang, Chengchi, Tan, Li, Xiong, Fan, Zeng, Honghui, and He, Shunping
- Subjects
FRESHWATER biodiversity ,FISH communities ,GENETIC barcoding ,FISHING villages ,BIODIVERSITY monitoring ,GENETIC markers ,GEOGRAPHICAL distribution of fishes - Abstract
East Lake in Wuhan, China, harbors a high number of freshwater fish species of great conservation value, concurrently serving as vital resources for local livelihoods. However, the ecosystem is threatened by an array of anthropogenic activities, thus requiring consistent monitoring of the local fish community to enable more efficacious conservation management. In place of conventional surveying methods, we undertook the first analysis of the fish distribution within East Lake via metabarcoding of environmental DNA (eDNA). The accuracy and efficacy of eDNA metabarcoding rely heavily upon selecting an appropriate primer set for PCR amplification. Given the varying environmental conditions and taxonomic diversity across distinct study systems, it remains a challenge to propose an optimal genetic marker for universal use. Thus, it becomes necessary to select PCR primers suitable for the composition of fish in the East Lake. Here, we evaluated the performance of two primer sets, Mifish-U and Metafish, designed to amplify 12S rRNA barcoding genes in fishes. Our results detected a total of 116 taxonomic units and 51 fish species, with beta diversity analysis indicating significant differences in community structure diversity between the six sampling locations encompassing East Lake. While it was difficult to accurately compare the species-level discriminatory power and amplification bias of the two primers, Mifish outperformed Metafish in terms of taxonomic specificity for fish taxa and reproducibility. These findings will assist with primer selection for eDNA-based fish monitoring and biodiversity conservation in the East Lake and other freshwater ecosystems. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
14. Evaluating the effectiveness of the eRNA technique in monitoring fish biodiversity – A case study in the Qingdao offshore, China
- Author
-
Wenqiong Li, Hui Jia, and Hui Zhang
- Subjects
eRNA technique ,eDNA technique ,Fish biodiversity ,Qingdao offshore ,Ecology ,QH540-549.5 - Abstract
With the continuous intensification of human activities, fish biodiversity has been reduced in the Yellow Sea. Therefore, accurate monitoring methods are crucial for determining fish biodiversity in the target area. The environmental DNA (eDNA) technique has emerged as a promising non-invasive method, but it is prone to false positives. The rapid degradation of environmental RNA (eRNA) has the potential to reduce false positives in the eDNA technique; however, there is limited research on using the eRNA technique to study fish biodiversity. This study aimed to explore a suitable sampling method for extracting sufficient eRNA from seawater samples. Furthermore, we performed a case study in Qingdao offshore, China, to survey fish species and community composition based on the eRNA and eDNA techniques in November 2022 using seawater samples collected from 19 sampling sites. We compared the results with data obtained through traditional field survey (TFS) methods and examined the relationship between fish species and environmental factors. The results revealed a significant overlap between fish species detected by the eRNA and eDNA techniques, with the eRNA technique demonstrating higher sensitivity and positive predictivity, and fewer false positives compared to those of eDNA. Our study highlighted the potential of the eRNA technique as a powerful tool for improving the detection rate of fish species in marine ecosystems. more...
- Published
- 2024
- Full Text
- View/download PDF
15. A SYSTEMATIC CHECKLIST OF FISHES IN HIMALAYAN RIVER GHAGHARA, EMERGING THREATS AND CONSERVATION MANAGEMENT ALONG WITH IUCN STATUS.
- Author
-
Sahu, Ashish, Gautam, Rohit Kumar, Sharma, Neelam, Kanoujiya, Shivaji, and Singh, Mahender
- Subjects
BIGHEAD carp ,AQUATIC plants ,BIODIVERSITY conservation ,FISH habitats ,WATER hyacinth ,FISH diversity ,ECOSYSTEMS - Abstract
The present study illustrates a systematic checklist of the fishes of Ghaghara River, as one of the richest ecosystem of fish diversity within the Northern Himalayan region of India, including notes on vernacular names and IUCN conservation status. This checklist includes 78 finfishes belonging to 11 orders, 27 families and 56 genera. Among these, 67 species belong to the Least Concern (LC). Two species are listed under Near Threatened (NT) and Endangered (EN), whereas Hypophthalmichthys nobilis listed in Data Deficient (DD) category of the IUCN Red list in 2023. Major threats to Ghaghara basin are destructive fishing, using small size mesh net, over-exploitation of fishes, juvenile & brooder fish, sand mining, erosion, sedimentation, Pollution, habitat loss, spread of Invasive species and infestation of Water hyacinth (Eichhornia crassipes) etc. This result is expected to contribute skeletal information for future studies in this river basin. Thus, an urgent need exists for taking up research on fish fauna and their habitat. Restoration measures have been proposed based on an ecosystem-scale approach to biodiversity conservation. Moreover, there is a need to maintain this valuable ecosystem to be ecofriendly for the aquatic flora and fauna to thrive. The authors recommend a complete survey of this riverine ecosystem for biodiversity and conservation point of view. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
16. Sustainable Management of Exotic Fish Biodiversity in Karnataka: Status, Challenges, and Threats.
- Author
-
Chakma, Amie, Pappuswamy, Manikantan, and Chaudhary, Aditi
- Subjects
FISHERY management ,BIOLOGICAL invasions ,INTRODUCED species ,BIODIVERSITY ,FISH diversity - Abstract
Fish biodiversity, a significant part of the aquatic ecosystem, has been studied widely in India. However, the distribution and diversity of fish species have not been well-researched at the state and/or regional levels. Karnataka is bestowed with 8% of the country's water resources, which are under extreme pressure because of unregulated population growth, biological invasion, and developmental requirements. Since the middle of the nineteenth century, India has been introducing alien species to its water bodies. Currently, 13.6% of the fish diversity in India is exotic and has been established voluntarily or involuntarily for various purposes. The establishment of invasive alien fishes negatively influences native fish communities around the globe. In general, most publications present the latest status of ichthyofauna in several regions of Karnataka; however, there is no up-to-date documentation on strategic environmental developments and unforeseen challenges, such as invasive alien species (IAS). This study reconstructs existing knowledge while analytically reviewing challenges, potential management techniques, advancements, and the impacts of climate change and disseminates the data necessary for the comprehension of the biological invasion of IAS. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
17. Revisiting the species list of freshwater fish in Israel based on DNA barcoding.
- Author
-
Tadmor‐Levi, Roni, Feldstein‐Farkash, Tamar, Milstein, Dana, Golani, Daniel, Leader, Noam, Goren, Menachem, and David, Lior
- Subjects
- *
GENETIC barcoding , *FRESHWATER fishes , *FRESHWATER biodiversity , *FISH conservation , *FISH populations - Abstract
Israel's region forms a continental bridge; hence, the freshwater fish fauna in Israel consists of unique populations of species that originated from Africa, Asia, or Europe and are often endemic or at the edge of their distribution range. Worldwide, fish biodiversity suffers significantly from pressures and disturbances of freshwater habitats, especially in arid regions, such as in parts of Israel. Biodiversity conservation requires efficient tools for monitoring changes in populations. DNA barcoding, by complementing and enhancing species identification, provides such monitoring tools. In this study, over 200 specimens representing over 28 species were DNA barcoded and together with previously available records, a DNA barcoding database for freshwater fish of Israel was established. Of the 71 distinct barcodes generated, 37% were new, attesting to the uniqueness of fish populations in Israel. For most species, morphological and molecular species identifications agreed. However, discrepancies were found for five genera. Based on DNA barcoding, we propose Acanthobrama telavivensis as a junior synonym for Acanthobrama lissneri. In Garra spp., we propose splitting Garra nana into two species and assigning Garra rufa in the region to Garra jordanica, or possibly to two species. Israeli Pseudophoxinus kervillei is not the same species as in Syria and Lebanon. However, Pseudophoxinus syriacus might not be endangered since it is genetically very similar to Pseudophoxinus drusensis. In Israel, instead of five reported Oxynoemacheilus species, combining DNA barcoding with morphology suggests only three. Genetic and geographic separation suggested that Aphanius mento is likely a species complex. The study provides a thorough barcoding database, suggests significant species reconsiderations in the region, and highlights the Sea of Galilee and the Beit She'an valley streams as biodiversity "hotspots." This study will therefore promote further studying of the fish species in the region and their ecology, as well as the monitoring and conservation of freshwater fish biodiversity in Israel and the region. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
18. Assessing fish diversity in abandoned mining ponds in Madre de Dios, Peru, using environmental DNA
- Author
-
Camila Timana‐Mendoza, Alonso Reyes‐Calderon, Patrick Venail, Julio M. Araújo‐Flores, and Mónica C. Santa‐Maria
- Subjects
Amazonia ,ASGM ,eDNA ,Fish biodiversity ,Environmental sciences ,GE1-350 ,Microbial ecology ,QR100-130 - Abstract
Abstract The Peruvian region of Madre de Dios is a biodiversity hotspot located in the Andean‐Amazon region. Since the 1970s, it has experienced the harsh effects of artisanal and small‐scale gold mining (ASGM), which has transformed the primary forests into numerous small mining ponds left abandoned after extraction. Preliminary surveys indicate that these ponds are being recolonized by surrounding biodiversity. These assessments are typically carried out using traditional methods that are costly, difficult to deploy at multiple locations, and have raised safety concerns. In this context, environmental DNA (eDNA) becomes a useful tool for biodiversity monitoring due to its simplicity for sample collection and performance to identify taxonomic groups. In this study, we evaluated fish biodiversity in two mining ponds created by ASGM along with two nearby pristine lakes, unimpacted by mining operations but also influenced by seasonal flooding. We compared two alternative eDNA processing methods and contrasted our results with historic data from traditional biodiversity monitoring. Both eDNA‐based methods yielded comparable results, varying only in logistic requirements and costs. In total, we detected 85 fish MOTUs (22 at the species level) from 5 orders, 22 families, and 41 genera. Some of the species identified with eDNA were rarely registered by traditional monitoring, and we could identify 6 genera associated with ASGM mining ponds only. A major restriction of the eDNA approach in this location was the insufficient local taxa registered in genomic databases which limited our taxonomic resolution. Despite this limitation, our results indicate that eDNA could be a powerful tool for biodiversity estimations in the Western Amazon, identifying more taxa, with much less time and money invested than traditional monitoring. Our results also confirm that abandoned mining ponds are being recolonized by surrounding ichthyofauna, reaching richness levels above nearby unmined oxbow lakes used as reference. more...
- Published
- 2024
- Full Text
- View/download PDF
19. Conservation of teleost fishes: Application of reproductive technologies
- Author
-
Ian Mayer and Martin Pšenička
- Subjects
Fish biodiversity ,Anthropogenic threats ,In situ and ex situ conservation ,Reproductive technologies ,Conservation genomics ,Zoology ,QL1-991 ,Reproduction ,QH471-489 - Abstract
Fishes are by far the most species-rich group of vertebrates, with 36,105 species currently recognised, approximately the same number of species as that of all non-fish vertebrates combined. Recent decades have witnessed dramatic population declines for many fish species, together with a loss in overall fish biodiversity. Globally, fish biodiversity is being threatened by a multitude of anthropogenic impacts including overfishing, habitat loss, pollution, aquaculture, loss of river connectivity, climate change and the impact of alien species. Nowhere is the world’s biodiversity crisis more acute than in freshwater ecosystems. While rivers, lakes and wetlands cover less than 1% of the planet’s total surface, they are home to over half the world´s fish species. One third of freshwater fishes are now threatened with extinction, and 80 species are already extinct. This review covers the main drivers of declining fish biodiversity, and details remedial strategies aimed at conserving both marine and freshwater fish biodiversity. The preservation of genetic resources through the cryobanking of reproductive cells and tissues, collectively known as germplasm, will be a valuable tool in the conservation of fish biodiversity. With the help of a range of emerging reproductive technologies, frozen germplasm will play a key role in future in situ and ex situ conservation initiatives. The ability to establish cryo-banks for the full range of fish germplasm, including sperm, oocytes, embryos and germ cells represents a powerful tool for use in the conservation of threatened fish species. The rapid advance in next-generation sequencing technologies, together with the proliferation of resources such as fully sequenced fish genomes is expected to result in a rapid expansion in the application of conservation genomics to the conservation and management of fish populations, and be instrumental in formulating mitigations directed at conserving fish biodiversity, through both in situ and ex situ conservation initiatives. more...
- Published
- 2024
- Full Text
- View/download PDF
20. Synergistic Effects of Climate Change and Alien Fish Invasions in Freshwater Ecosystems: A Review.
- Author
-
Carosi, Antonella, Lorenzoni, Francesca, and Lorenzoni, Massimo
- Subjects
- *
FRESHWATER fishes , *BODIES of water , *GLOBAL warming , *WATER salinization , *FISH communities , *ECOSYSTEMS , *CLIMATE change , *PLANT invasions - Abstract
The interaction between climate warming and alien fish invasions could have severe consequences in inland waters, which represent isolated environments with high biodiversity richness. Due to the current climatic trend, increasing water temperatures and salinization, shorter ice cover period, and altered flow regimes are predicted for these environments. The aim of this review is to offer a comprehensive analysis at a global scale of the recent studies available in the literature, focused on the responses of invasive freshwater fish to the effects of climate change in both lotic and lentic environments. To achieve this purpose, we selected 34 relevant papers, using the Scopus and Google Scholar database. New alien species establishment, distribution range expansion of species already introduced, and exacerbating impacts on freshwater ecosystems and the native fish communities they host were included in the topics covered by the analyzed papers. Despite the uncertainties related to the unpredictability with which the effects of global warming will occur, the findings of the selected studies served as a support to evaluate conservation and management implications, with particular reference to possible mitigation strategies. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
21. Fish diversity and community structure of a wetland system of the western Mediterranean Basin of Türkiye: Lake Koca (Dalaman).
- Author
-
Kaymak, Nehir, Emre, Yılmaz, Emre, Nesrin, and Akın, Şenol
- Subjects
FISH diversity ,FISH communities ,LITTORAL zone ,FISHING villages ,WATERSHEDS ,ENDEMIC fishes ,WETLANDS - Abstract
Copyright of Ege Journal of Fisheries & Aquatic Sciences (EgeJFAS) / Su Ürünleri Dergisi is the property of Ege Journal of Fisheries & Aquatic Sciences (EgeJFAS) / Su Urunleri Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
- Full Text
- View/download PDF
22. Status of fish assemblage structure in the Ganga and Indus riverine systems of the western Himalaya.
- Author
-
Choudhary, Megha, Thakur, Kushal, Brar, Bhavna, Kumar, Sunil, Sharma, Dixit, Kumar, Rakesh, and Mahajan, Danish
- Subjects
FISH declines ,FISH diversity ,FISHERY resources ,DAM design & construction ,SUSTAINABLE fisheries ,FISHERY management - Abstract
Copyright of World Water Policy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
- Full Text
- View/download PDF
23. Projected flow regimes and biodiversity changes under climate change in the planning western route source areas of the South-to-North Water Diversion Project
- Author
-
Di Fan, Sidong Zeng, Hong Du, Yuanxin Ren, and Jun Xia
- Subjects
Climate change ,Flow regime ,Fish biodiversity ,Source areas of Western Route Project ,Ecology ,QH540-549.5 - Abstract
Scientific evaluation of the eco-hydrological regimes is of great significance for water resource management and aquatic ecosystem protection. The paper took the western route source areas (WRSA) of the South-to-North Water Diversion Project (SNWDP) as the research region. In order to quantify climate-induced eco-hydrological effects, a general framework was proposed to predict changes in flow regimes and fluvial biodiversity under climate change: The coupling of Global Climate Models (GCMs) and the Distributed Time Variant Gain Model (DTVGM) was used to simulate discharge under different climate conditions. Based on Indicators of Hydrologic Alteration (IHA), changes in eco-hydrological regimes were evaluated by using the Range of Variability Approach (RVA), assessment of overall hydrological change degree (D0), and Shannon index (SI). Changes in discharge, flow regimes, and fluvial biodiversity of WRSA were analyzed during the projected period (2041–2100) compared to the base period (1960–2014). According to the projections, under four SSPs-RCPs scenarios, the future discharge of WRSA increases significantly compared to the base period. D0 of WRSA is moderately or severely changed, and hydrological changes are mainly reflected in high flows such as monthly median flows during flood season, maximum flows, and high pulse duration. While flow regimes are disturbed, SI values of WRSA keep rising and the biodiversity is improved. The increase of discharge and SI becomes progressively greater with elevated radiation intensity, and the quantity of severely altered indicators of IHA increases. In conclusion, future hydrological alterations in SNWDP are expected to further intensify with higher levels of climate change, and these changes are generally conducive to the improvement of fish biodiversity. more...
- Published
- 2023
- Full Text
- View/download PDF
24. Sustainable Management of Exotic Fish Biodiversity in Karnataka
- Author
-
Amie Chakma, Manikantan P, and Aditi Chaudhary
- Subjects
IAS(Invasive alien species) ,Biological invasion ,Fish biodiversity ,Threats ,Conservation ,Aquatic ecology ,Human ecology. Anthropogeography ,GF1-900 ,Economic theory. Demography ,HB1-3840 - Abstract
Fish biodiversity, a significant part of the aquatic ecosystem, has been studied widely in India. However, the distribution and diversity of fish species have not been well-researched at the state and/or regional levels. Karnataka is bestowed with 8% of the country’s water resources, which are under extreme pressure because of unregulated population growth, biological invasion, and developmental requirements. Since the middle of the nineteenth century, India has been introducing alien species to its water bodies. Currently, 13.6% of the fish diversity in India is exotic and has been established voluntarily or involuntarily for various purposes. The establishment of invasive alien fishes negatively influences native fish communities around the globe. In general, most publications present the latest status of ichthyofauna in several regions of Karnataka; however, there is no up-to-date documentation on strategic environmental developments and unforeseen challenges, such as invasive alien species (IAS). This study reconstructs existing knowledge while analytically reviewing challenges, potential management techniques, advancements, and the impacts of climate change and disseminates the data necessary for the comprehension of the biological invasion of IAS. more...
- Published
- 2023
- Full Text
- View/download PDF
25. Coastal Fish Fauna in the Cystoseira s.l. Algal Belts: Experiences from the Northern Adriatic Sea.
- Author
-
Lipej, Lovrenc, Ivajnšič, Danijel, Pitacco, Valentina, Trkov, Domen, Mavrič, Borut, and Orlando-Bonaca, Martina
- Subjects
CYSTOSEIRA ,HABITATS ,FISH communities ,TERRITORIAL waters ,CAMCORDERS ,HABITAT selection ,FISHES - Abstract
Cystoseira s.l. forests are recognised as important habitats which host diverse coastal fish assemblages. Many fish species use such habitats as feeding, breeding, and nursery grounds. Since the coastal fish community depends on the availability of dense macroalgal belts, the decline of these habitats in the Mediterranean Sea also affects the density of coastal fish species. We studied the coastal fish assemblage in Cystoseira s.l. forests in three consecutive years 2019–2021 in the Gulf of Trieste (Adriatic Sea). Data on coastal fish fauna were collected by visual counts conducted by SCUBA diving. Data on algal cover and habitat types were obtained by recording with a video camera. Similarities and differences in the fish community were analysed in terms of habitat and substrate preferences. A total of 34 species were recorded in Cystoseira forests. The results of the present study show that the different algal cover and associated depth gradient have different effects on the fish assemblage in coastal waters, affecting species composition and abundance. For many species, particularly labrids and sea breams, there is a decreasing temporal trend in frequency of occurrence and density. However, fish community trends can be used as a good "proxy" to evaluate the algal belt status. Our results indicate that rapid conservation and restoration actions are needed to stem the decline of Cystoseira s.l. forests. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
26. Community-Managed Fish Sanctuaries for Freshwater Fishery Biodiversity Conservation and Productivity in Malawi.
- Author
-
Jamu, Daniel M., Torell, Elin C., and Chisale, Essau
- Abstract
Key fish breeding and other biodiverse areas in Malawian lakes are under threat from illegal fishing, the siltation of key breeding areas (due to deforestation-induced soil erosion), and the clearing of shoreline aquatic vegetation. Freshwater protected areas, also called sanctuaries, have the potential to support the restoration of degraded aquatic environments and protect fisheries' biodiversity. In Malawi, community-managed fish sanctuaries have been established by beach village committees (BVCs) throughout Lake Malawi, Lake Malombe, Lake Chilwa and Lake Chiuta. The sanctuaries were established to conserve exploited stocks, preserve biodiversity, and enhance fisheries' yield. The BVCs are aligned with local decentralized village development committees linked to District Councils. Together, they constitute a defragmented decentralized ecosystem-based management of fishery resources. A monitoring study was conducted in sanctuaries in the four lakes during the wet and dry season over three years (2016–2019). The monitoring was carried out to evaluate the sanctuaries' biological performance. The results showed that community-managed sanctuaries contributed to a 24% increase in the total number of observed species. The Shannon Diversity Index increased from an average 1.21 to 1.52. Small and mid-size (<50 ha) sanctuaries showed a higher performance improvement than large (>50 ha) sanctuaries. This is likely due to multiple factors, including a higher level of fish movement and the greater ability of communities to surveil and enforce smaller sanctuaries. The participation of communities in monitoring enhanced the demonstration effects of sanctuaries. This, in turn, encouraged communities to expand the number and size of the sanctuaries. The biological performance results indicate that community-managed freshwater sanctuaries can be used to protect and restore fish biodiversity in freshwater lakes in Africa. Linking the BVCs to defragmented decentralized structures ensures that the interconnectedness between ecosystem uses, including forestry, agriculture, and tourism, which impinge on fish productivity, are addressed holistically. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
27. AN OVERVIEW OF FISH BIODIVERSITY AND SOCIOECONOMIC SITUATION OF THE PADMA RIVER’S FISHER COMMUNITY IN BANGLADESH
- Author
-
Rabeya Akter, Sohel Hasan Sharif, and Mujibur Rahman Khan
- Subjects
fish biodiversity ,fishing gear ,socio-economic status ,padma river ,Agricultural industries ,HD9000-9495 - Abstract
The current study focused on the status of fishing and livelihood status of fishers through employing household interviews, Focus Group Discussions and key informant interviews at Sujanagar Upazila under the Pabna district. The catch was quite substantial during the period of the study, and fishing operation was especially intense from early hours to midday. There were three main types of gears recorded in this study namely nets, traps, and wounding gears and the most used gear was Thela jal (push net). The result of this research indicates that a total of 33 fish species were identified where 18% of catfish, 31% of carp, 9% of snakehead, 6% of eel, 12% of barbs, clupeids and minnows, 18% of perch and 6% of crustaceans were identified. Fishing is the primary source of income for 68% of the fishermen, which has a serious influence on their livelihood. According to the study’s findings, the majority of fishers (62%) had tin-shaded dwellings and 82% of the fishermen had tube well as the source of drinking water. The fishers’ healthcare facilities were poor. About 66% of fishers got electricity and 54% of them belonged to the medium income (TK. 41,000-70,000/year) group. The overall livelihood condition of the fishers was unsatisfying related to socioeconomic obstacles such as an increase in the number of fishers, limited income, a lack of credible revenue-producing activities, credit issues, infringement, price inflation, and resource disputes among stakeholders. So the comprehensive strategies and their efficient execution are essential for improving fishermen’s livelihood. more...
- Published
- 2022
- Full Text
- View/download PDF
28. UPDATED OVERVIEW OF MARINE FISH BIODIVERSITY: SCIENTIFIC SUPPORT FOR AN ECOSYSTEM-BASED MANAGEMENT OF THE DANUBE DELTA BIOSPHERE RESERVE.
- Author
-
NIȚĂ, Victor, GALAȚCHI, Mădălina, and NENCIU, Magda
- Subjects
- *
BIOSPHERE reserves , *MARINE biodiversity , *MARINE fishes , *BIOINDICATORS , *FISH populations , *FISH communities , *STURGEONS - Abstract
Fish biodiversity is a key indicator of the health of a waterbody and the structure and function of fish communities are considered good indicators of the ecological status of marine ecosystems. Therefore, the long-term assessment and the development of predictions regarding the size and productive capacity of fish populations are necessary, aiming at ensuring an ecosystem-based management of living resources. In the frame of the revision of the Danube Delta Biosphere Reserve Management Plan, an updated evaluation of fish species present in the marine zone (ROSCI0066) was performed. The scientific fishing (by survey trawling and gillnetting) revealed a rich ichthyofauna: 32 taxa, belonging to 21 families were identified. The species array is diverse, including both economically important fish (turbot, shads, anchovy, sprat) and species of high conservative interest (sturgeons), emphasizing the crucial importance of this area as feeding and spawning ground of Black Sea ichthyofauna. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
29. Fish biodiversity in different types of tributary mouths located within impounded sections of Swedish boreal rivers.
- Author
-
Näslund, J., Bowes, R., Sandin, L., Bergman, E., and Greenberg, L.
- Subjects
FISH communities ,BIODIVERSITY ,SPECIES diversity ,FISH diversity ,SEDIMENT transport ,WILDLIFE conservation - Abstract
Large boreal rivers in Sweden are generally impounded by hydropower dams and a large proportion of main stem shallow flowing habitats have been lost. Tributaries often contain the last undisturbed habitats and could be important for the conservation of species diversity. In particular, tributary mouth areas could be biodiversity hot-spots, due to their vicinity to the main stem and favorable environmental conditions. In this study, we investigate whether tributary mouth areas in two impounded boreal rivers (Ume River and Lule River) could be regarded as biodiversity hot-spots for fish. Based on standardized electrofishing in 20 tributary mouths, we find that overall fish diversity is generally low. The highest species richness and diversity was found in mouth areas dominated by intermediate substrate sizes (gravel – cobble). Few, if any, species were found in areas where fine sediments (smaller than sand) dominated. The tributary mouth areas had similar species richness and diversity as areas in the tributaries located 1-km upstream of the mouth, but the fish community composition often differed between these two types of sites. Management action favoring fish diversity in the tributary mouth areas could include protection or rehabilitation of areas dominated by medium sized substrate and reduction of erosion and transport of fine sediments in the tributaries. Overall, we find no support for tributary mouths being hot-spots for fish biodiversity and while some patterns in diversity gives hints on suitable management action, it is important to further understand impacts in tributaries and their mouths and the temporal dynamics of the fish community. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
30. 基于环境DNA宏条码和底拖网的珠江河口鱼类多样性.
- Author
-
蒋佩文, 李敏, 张帅, 陈作志, and 徐姗楠
- Abstract
Copyright of Journal of Hydrobiology / Shuisheng Shengwu Xuebao is the property of Editorial Department of Journal of Hydrobiology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2022
- Full Text
- View/download PDF
31. Fish Community Structure and Biomass Particle-Size Spectrum in the Upper Reaches of the Jinsha River (China).
- Author
-
Yan, Taiming, He, Jiayang, Yang, Deying, Ma, Zhijun, Chen, Hongjun, Zhang, Qian, Deng, Faqiang, Ye, Lijuan, Pu, Yong, Zhang, Mingwang, Yang, Song, Yang, Shiyong, Tang, Ziting, and He, Zhi
- Subjects
- *
FISH communities , *FISHING villages , *BIOMASS , *HABITAT conservation , *FISH diversity , *NUMBERS of species , *FISH conservation , *DISSOLVED oxygen in water - Abstract
Simple Summary: From 2019 to 2020, 28 species of fish were collected from the upper reaches of the Jinsha River. The dominant species of fish were Triplophysa stenura, Schizothorax wangchiachii, and Schizopygopsis malacanthus. Fish diversity was at a deficient level, and flow velocity, altitude, and dissolved oxygen were the main influencing factors causing the differences in fish community structure in the upper Jinsha River. The abundance/biomass curve showed that the fish community in the upper Jinsha River was moderately or seriously disturbed. The standardized biomass size spectrum of fish showed that the degree of disturbance of fish in tributaries was much lower than that in the main stream. Compared with the historical data, the structure of the fish community in the Jinsha River changed significantly, with more exotic species and smaller individual fish. It is suggested that habitat conservation strategies be adopted in the upper tributaries of the Jinsha River to provide a reference for the restoration of fishery resources and the conservation of fish diversity in the Yangtze River. To understand the characteristics of the fish community structure and biomass particle-size spectrum in the upper reaches of the Jinsha River, fish and environmental surveys were conducted in 21 segments of the upper reaches of the Jinsha River in September 2019 and June 2020. A total of 4062 fish belonging to 2 orders, 5 families, 18 genera, and 28 species were collected. Among them, Cyprinidae fish were the most abundant (14 species), accounting for 50.00%. The Shannon index and Pielou evenness index values varied from 0.402–1.770 and 0.254–0.680, respectively. The dominant species of fish were Triplophysa stenura, Schizothorax wangchiachii, and Schizopygopsis malacanthus. Redundancy analysis (RDA) was used to analyse the relationship between the fish community and environmental factors. Velocity, altitude, and dissolved oxygen were the main influencing factors of fish community structure differences in the upper reaches of the Jinsha River. The abundance/biomass curves showed that the fish communities in the upper reaches of the Jinsha River were moderately or severely disturbed. The standardized biomass particle-size spectrum of fish showed that the degree of disturbance of fish in tributaries was much lower than that in the main stream. Compared with the historical data, the fish community structure in the Jinsha River has changed significantly, with the number of exotic species increasing, and the individual fish showing miniaturization and younger ages. It is suggested that habitat conservation strategies be adopted in the upper tributaries of the Jinsha River to provide a reference for the restoration of fishery resources and the conservation of fish diversity in the Yangtze River. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
32. Environmental DNA persistence and fish detection in captive sponges.
- Author
-
Cai, Wang, Harper, Lynsey R., Neave, Erika F., Shum, Peter, Craggs, Jamie, Arias, María Belén, Riesgo, Ana, and Mariani, Stefano
- Subjects
- *
BIODIVERSITY monitoring , *WATER filtration , *WATER sampling , *PARTICLE dynamics , *SIZE of fishes - Abstract
Large and hyperdiverse marine ecosystems pose significant challenges to biodiversity monitoring. While environmental DNA (eDNA) promises to meet many of these challenges, recent studies suggested that sponges, as "natural samplers" of eDNA, could further streamline the workflow for detecting marine vertebrates. However, beyond pilot studies demonstrating the ability of sponges to capture eDNA, little is known about the dynamics of eDNA particles in sponge tissue, and the effectiveness of the latter compared to water samples. Here, we present the results of a controlled aquarium experiment to examine the persistence and detectability of eDNA captured by three encrusting sponge species and compare the sponge's eDNA capturing ability with established water filtration techniques. Our results indicate that sponges and water samples have highly similar detectability for fish of different sizes and abundances, but different sponge species exhibit considerable variance in performance. Interestingly, one sponge appeared to mirror the eDNA degradation profile of water samples, while another sponge retained eDNA throughout the experiment. A third sponge yielded virtually no DNA sequences at all. Overall, our study suggests that some sponges will be suitable as natural samplers, while others will introduce significant problems for laboratory processing. We suggest that an initial optimization phase will be required in any future studies aiming to employ sponges for biodiversity assessment. With time, factoring in technical and natural accessibility, it is expected that specific sponge taxa may become the "chosen" natural samplers in certain habitats and regions. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
33. Fish Biodiversity, Threat Status and Conservation Significance of the Jamuna River, Bangladesh
- Author
-
Paul Sulav Indra, Majumdar Bhaskar Chandra, Hasan Mahmudul, Sarker Apurbo Kumer, Baidya Arpan, and Hakim Md. Azizul
- Subjects
jamuna river ,fish biodiversity ,diversity index ,iucn ,conservation ,Aquaculture. Fisheries. Angling ,SH1-691 - Abstract
The present survey aimed to explore the fish fauna diversity, abundance and conservation status in the Jamuna River, a tributary of the River Brahmaputra, Bangladesh. During the study period from November 2018 to October 2019, a total of 55 species of fish were recorded, belonging to 6 orders, 20 families and 41 genera from the five selected stations near the river. Orders Cypriniformes and Siluriformes were recorded as the dominant group in the fish fauna community that comprises 34.55% and 30.91% of total species, respectively. Various types of Small Indigenous Species (SIS) and a total of 26 International Union for Conservation of Nature (IUCN) red-listed species were recorded. Population indices, viz. Shannon–Weaver index (H), Simpson’s dominance index (D), Simpson’s index of diversity (1-D), Margalef’s index (d) and Evenness (E), were applied to demonstrate the species diversity, richness and evenness of fish, and their overall values were 1.28-1.48, 0.26-0.33, 0.67-0.74, 1.22-1.46 and 0.77-0.86, respectively. To sustain the prospect of fisheries biodiversity in the Jamuna River of Bangladesh, different fish management and conservation plan of action specifically establishing and maintaining fish sanctuaries, banning indiscriminate fishing and the use of destructive fishing gears for the protection of the breeding and nursery grounds of fish should be taken into consideration with utmost priority. more...
- Published
- 2021
- Full Text
- View/download PDF
34. Issues on the inclusion of Puntius denisonii (Day), a freshwater ornamental fish of global value, as Schedule-I species under the Wild Life (Protection) Amendment Act, 2021 of India
- Author
-
Atul Kumar Jain, T. V. A. Mercy, and Abhinika Jain
- Subjects
Puntius denisoni ,Sahyadria denisonii ,Densison barb ,redline torpedo barb ,Western Ghats ,fish biodiversity ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Puntius denisonii is popularly known as Miss Kerala in India or Denison barb or Red line torpedo barb in the global ornamental fish trade. The species is endemic to fast-flowing rivers and streams of the Western Ghats of India. The species was not very popular earlier in aquatic trade but has been in great demand in global aquarium trade since it was exhibited at AQARAMA 1997 in Singapore and ranked third under the new species category. The export of the species from India started in 1996–1997, which increased progressively and constituted about 60%–65% of a total of 1.44 million US$ worth of ornamental fish exported from India in 2007–2008. Thereafter, it started declining and presently became negligible. It was attributed to depleting stocks of P. denisonii in rivers and streams of Western Ghats. The species was recommended to be listed as endangered on the IUCN red list in a CAMP workshop held at NBFGR, Lucknow, India in September 1997, owing to habitat degradation and the declining number of mature individuals in the wild. It was categorized as Vulnerable in 2009 and Endangered in 2015 under the IUCN red list. The Department of Fisheries, Government of Kerala has restricted the collection of smaller size fish from natural water bodies since 2008 to revive wild stocks. The Ministry of Environment, Forest and Climate Change, Government of India has now proposed to include P. denisonii along with two other freshwater fish species, Semiplotus semiplotus (Assamese kingfish) and Osteobrama belangeri (Manipur osteobrama), as Schedule-I species under the Wild Life (Protection) Amendment Act, 2021 of India. The species listed under this Schedule are prohibited to be hunted throughout the country. The captive breeding technology of P. denisonii has already been developed in the country more than a decade back, and fish is being produced commercially at several farms presently including hatcheries of the Kerala Government. The species is also being cultured and produced on a commercial scale by many ornamental fish farmers of Indonesia and supplied to the global ornamental fish trade at cheaper rates, and more color strains. The major factors that are responsible for the depletion of the stocks of P. denisonii and the overall fish biodiversity of Western Ghat regions are discussed in detail. The conflicts and repercussions that will arise because of the inclusion of Denison Barb or any other freshwater fish as Schedule-I species under the Wild Life (Protection) Amendment Act, 2021 of India are also discussed. more...
- Published
- 2022
- Full Text
- View/download PDF
35. Spatial Variation in the Composition and Diversity of Fishes Inhabiting an Artificial Water Supply Lake, Eastern China
- Author
-
Chao Guo, Shiqi Li, Wei Li, Chuansong Liao, Tanglin Zhang, Jiashou Liu, Lin Li, Jiaxin Sun, Xingwei Cai, and Adam G. Hansen
- Subjects
fish community ,fish biodiversity ,artificial water supply lake ,Lake Yanlong ,regulation strategies ,Evolution ,QH359-425 ,Ecology ,QH540-549.5 - Abstract
With the intensification of eutrophication, many artificial water supply lakes that act as a biological filter for water diverted from rivers have been built to alleviate water scarcity in Eastern China. In this study, we selected Lake Yanlong, a representative artificial water supply lake in Yancheng City, as our experimental lake to explore how the community composition of fishes changed among different habitat types and assess potential consequences for effective water treatment. From October 2015 to October 2020, we conducted quarterly surveys of fish communities and environmental factors in the Mangshe River (MR; water for lake) compared to four different water treatment zones of Lake Yanlong (PZ, the pretreatment zone with inlet from the MR; EZ, the emergent macrophyte zone; SZ, the submerged macrophyte zone; DZ, the deep purification zone with outlet to urban waterworks). A total of 16,339 individual fish belonging to 11 families and 49 species were collected. Six of the eight dominant species observed across zones were small-bodied fishes. Despite reduced fish species richness, the relative abundance and biomass of fishes tended to be higher in Lake Yanlong relative to the MR. The Shannon-Wiener diversity index, Pielou evenness index, Simpson’s diversity index all decreased from the MR to the DZ in the following sequence: MR < PZ < EZ < SZ < DZ. Analysis of similarities and similarity percentage analysis confirmed that fish communities differed significantly among zones and Coilia ectenes, Carassius auratus, Pseudobrama simony, Hemiculter leucisculus, and Hemiculter bleekeri were the major differentiating species. Mantel’s test and redundancy analysis revealed that water depth, aquatic vegetation coverage, and phytoplankton concentrations were the major factors determining the spatial distribution of fishes when moving from the MR to the DZ of Lake Yanlong. Stocking piscivorous fish can be used as an effective measure to control the abundance of prolific small-bodied fishes in Lake Yanlong. The details backing these findings are important for understanding how the community composition of fishes among habitat types in Lake Yanlong influence water quality, and to develop suitable biomanipulation strategies for the management of fish resources and maintaining proper function of these artificial water supply lakes. more...
- Published
- 2022
- Full Text
- View/download PDF
36. Valley‐scale hydrogeomorphology drives river fish assemblage variation in Mongolia
- Author
-
Alain Maasri, Mark Pyron, Emily R. Arsenault, James H. Thorp, Bud Mendsaikhan, Flavia Tromboni, Mario Minder, Scott J. Kenner, John Costello, Sudeep Chandra, Amarbat Otgonganbat, and Bazartseren Boldgiv more...
- Subjects
beta diversity ,ecoregional differences ,functional process zones ,fish biodiversity ,macrosystem ecology ,riverine ecosystem synthesis ,Ecology ,QH540-549.5 - Abstract
Abstract River hydrogeomorphology is a major driver shaping biodiversity and community composition. Here, we examine how hydrogeomorphic heterogeneity expressed by Functional Process Zones (FPZs) in river networks is associated with fish assemblage variation. We examined this association in two distinct ecoregions in Mongolia expected to display different gradients of river network hydrogeomorphic heterogeneity. We delineated FPZs by extracting valley‐scale hydrogeomorphic variables at 10 km sample intervals in forest steppe (FS) and in grassland (G) river networks. We sampled fish assemblages and examined variation associated with changes in gradients of hydrogeomorphology as expressed by the FPZs. Thus, we examined assemblage variation as patterns of occurrence‐ and abundance‐based beta diversities for the taxonomic composition of assemblages and as functional beta diversity. Overall, we delineated 5 and 6 FPZs in river networks of the FS and G, respectively. Eight fish species were found in the FS river network and seventeen in the G, four of them common to both ecoregions. Functional richness was correspondingly higher in the G river network. Variation in the taxonomic composition of assemblages was driven by species turnover and was only significant in the G river network. Abundance‐based taxonomic variation was significant in river networks of both ecoregions, while the functional beta diversity results were inconclusive. We show that valley‐scale hydrogeomorphology is a significant driver of variation in fish assemblages at a macrosystem scale. Both changes in the composition of fish assemblages and the carrying capacity of the river network were driven by valley‐scale hydrogeomorphic variables. River network hydrogeomorphology as accounted for in the study has, therefore, the potential to inform macrosystem scale community ecology research and conservation efforts. more...
- Published
- 2021
- Full Text
- View/download PDF
37. Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways.
- Author
-
Masumoto, Taku, Nakai, Masahiko, Asaeda, Takashi, and Rahman, Mizanur
- Subjects
DAMS ,FISHWAYS ,GROUNDFISHES ,HABITAT selection ,FISH migration ,RIVER engineering - Abstract
The migration of fish is influenced by the unique environmental characteristics of the destination and migratory habitat preferences. There are three fishways in Miyanaka Intake Dam. The rock-ramp fishway was newly established in 2012, creating an environment with different flow velocities and water depths. The purpose of this study was to investigate the effectiveness of the new rock-ramp fishway for native fish through two surveys. In the first survey, traps were installed during the survey period in all three fishways and all fish were caught. The run-up environment was quantified by measuring the flow velocity. In the second survey, fish were caught by spectrum methods upstream and downstream from the dam. It was found that bottom-dwelling fish and swimming fish not bound to the bottom with low migration abilities used the rock-ramp fishway for migration and as a habitat. After the new rock-ramp fishway was built, catches increased upstream from the dam. Further, the rock-ramp fishway is a potential habitat for certain species, such as Cottus pollux. As this is the first study to demonstrate the effectiveness of rock-ramp fishways, the research results are expected to be valuable to fishery managers and those planning river engineering projects. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
38. Fish biodiversity assemblages and fishing gears used at Chinadi Beel in Narsingdi District of Bangladesh
- Author
-
Majumdar, Bhaskar Chandra, Paul, Sulav Indra, Hasan, Mahmudul, Kabir, Tamina, Islam, Mahibul, and Kabir, Ilias Ebne
- Published
- 2020
- Full Text
- View/download PDF
39. Alpine freshwater fish biodiversity assessment: an inter-calibration test for metabarcoding method set up
- Author
-
Giulia Riccioni, Isabelle Domaizon, Andrea Gandolfi, Massimo Pindo, Adriano Boscaini, Marine Vautier, Hans Rund, Peter Hufnagl, Stefanie Dobrovolny, Valentin Vasselon, Jonas Bylemans, Cuong Q. Tang, Nico Salmaso, and Josef Wanzenböck more...
- Subjects
fish biodiversity ,eDNA ,Alpine space ,Eco-AlpsWater ,metabarcoding ,Ecology ,QH540-549.5 - Abstract
The analysis of environmental DNA (eDNA) by high throughput sequencing (HTS) is proving to be a promising tool for freshwater fish biodiversity assessment in Europe within the Water Framework Directive (WFD, 2000/60/EC), especially for large rivers and lakes where current fish monitoring techniques have known shortcomings. These new biomonitoring methods based on eDNA show several advantages compared to classical morphological methods. The sampling procedures are easier and cheaper and eDNA metabarcoding is non-invasive and very sensitive, allowing for the detection of traces of DNA. However, eDNA metabarcoding methods need careful standardization to make the results of different surveys comparable. The aim of the EU project Eco-AlpsWater is to test and validate molecular biodiversity monitoring tools for aquatic ecosystems (i.e., eDNA metabarcoding) to improve the traditional WFD monitoring approaches in Alpine waterbodies. To this end, an inter-calibration test was performed using fish mock community samples containing either tissue-extracted DNA, eDNA collected from aquaculture tanks and eDNA samples collected from Lake Bourget (France). Samples were analysed using a DNA metabarcoding approach, relying on the amplification and HTS of a 12S rDNA marker, in two separate laboratories, to evaluate if different laboratory and bioinformatic protocols can provide a reliable and comparable description of the fish communities in both mock and natural samples. Our results highlight good replicability of the molecular laboratory protocols for HTS and good amplification success of selected primers, providing essential information concerning the taxonomic resolution of the 12S mitochondrial marker in describing the Alpine fish communities. Interestingly, different concentrations of species DNA in the mock samples were well represented by the relative DNA reads abundance. These tests confirm the reproducibility of eDNA metabarcoding analyses for the biomonitoring of freshwater fish inhabiting Alpine and peri-Alpine lakes and rivers. more...
- Published
- 2022
- Full Text
- View/download PDF
40. Temporal Changes in Taxonomic and Functional Diversity of Fish Assemblages in the Upper Yangtze River After Impoundment of the Three Gorges Reservoir, China
- Author
-
Chen Zhang, Fei Liu, Huanzhang Liu, Chunling Wang, Pengcheng Lin, and Xin Gao
- Subjects
community assembly ,habitat changes ,fish biodiversity ,species traits ,conservation ,Environmental sciences ,GE1-350 - Abstract
Anthropogenic disturbances are one of the primary factors that drive biodiversity loss. Temporal changes in biodiversity respond to such disturbances. In the present study, we investigated the temporal changes in taxonomic and functional diversity of fish assemblages in different habitats (Three Gorges Reservoir, TGR; running water above the TGR, UTGR; and tributary Chishui River, CSR) in the upper Yangtze basin after impoundment of the TGR from 2008 to 2015. During the survey, the taxonomic and functional composition of fish assemblages varied among the habitats. Although taxonomic diversity increased and functional diversity decreased significantly in the entire upper Yangtze basin, no significant changes in the diversities were observed in each habitat. The habitats showed directional changes in the composition of fish species. The slope of the directional changes in the TGR was more than that in the UTGR and CSR. These results indicated that the distribution of fish species was associated with the habitat after the impoundment. The assembly of the fish assemblage was driven primarily by the neutral process in the entire survey area but was promoted by a combination of species sorting and neutral process in each habitat. The impoundment caused more effects on the TGR than on the UTGR, but it slightly affected the CSR. Regarding fishing closure, conservation measures for fish diversity should be established according to the different habitats. The study findings suggest the removal of small dams in tributaries and ecological regulation in the mainstream and continuous monitoring of fish biodiversity. more...
- Published
- 2022
- Full Text
- View/download PDF
41. Increased Water Abstraction and Climate Change Have Substantial Effect on Morphometry, Salinity, and Biotic Communities in Lakes: Examples from the Semi-Arid Burdur Basin (Turkey).
- Author
-
Çolak, Mehmet Arda, Öztaş, Barış, Özgencil, İbrahim Kaan, Soyluer, Melisa, Korkmaz, Mustafa, Ramírez-García, Arely, Metin, Melisa, Yılmaz, Gültekin, Ertuğrul, Serhat, Tavşanoğlu, Ülkü Nihan, Amorim, Cihelio Alves, Özen, Can, Apaydın Yağcı, Meral, Yağcı, Abdulkadir, Pacheco, Juan Pablo, Özkan, Korhan, Beklioğlu, Meryem, Jeppesen, Erik, and Akyürek, Zuhal more...
- Subjects
BIOTIC communities ,CLIMATE change ,IMPORTANT bird areas ,GROUNDWATER ,WATER supply ,IRRIGATION water ,LAND cover ,LAKES - Abstract
Global warming and altered precipitation patterns are predicted to intensify the water loss in semi-arid and arid regions, and such regions in Turkey will be particularly affected. Moreover, water abstraction, not least for irrigation purposes, is expected to increase markedly, posing major threats to the water balance of the lakes and thus their biodiversity. Among the closed basins in Turkey, the Burdur Closed Basin (BCB), located in the southwest of Turkey, is expected to be most affected. The BCB includes several types of aquatic ecosystems which support high biodiversity, including one Ramsar site, six Important Bird Areas, and a considerable richness of native and endemic fish species. Therefore, it is essential to analyze the potential environmental impacts of climate change and increased water abstraction on BCB lakes and their biotic communities. Here, we combined historical data on ecosystems as well as meteorological, remote sensing, and ground-truth data to analyze the changes in the temperature and precipitation of the BCB, water surface areas, and land use, as well as the potential effects on waterbird and fish communities. We calculated the water budget to elucidate water availability in the basin over the last few decades and predicted future conditions based on rainfall and temperature forecasts using climate models. The Standardized Precipitation–Evapotranspiration Index (SPEI) was used to relate the water surface area to precipitation and temperature change in the basin. Crop-farming irrigation in the BCB has increased notably since 2004, leading to intensive water abstraction from the lakes and their inflows, as well as from ground water, to meet the increased demand for irrigation. The water abstraction from the lakes, inflows to the lakes, and the groundwater in the basin has increased the water loss in the catchment substantially. Remotely sensed data on lake surface areas showed a major shrinkage of shallow lakes in the last 40 years. Moreover, the largest lake in the basin, Lake Burdur, lost nearly half of its surface area, which is worrisome since the shallower areas are the most suitable for supporting high biodiversity. Climate models (CNRM-ESM2-1GCM for temperature and GFDL-ESM4-GCM for precipitation) suggest that from 2070, the BCB will face long-term, moderate-to-severe dry periods. This, and the increased demand for water for irrigation, along with climate change, may accelerate the drying of these lakes in the near future with devastating effects on the lake ecosystems and their biodiversity. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
42. Assessment of decadal changes in the tidepool fish assemblage of Danjo Islands in the northern East China Sea.
- Author
-
Arakaki, Seiji and Tokeshi, Mutsunori
- Abstract
Tidepools are a major component of coastal environments and useful for evaluating the potential impacts of various factors on marine environments. We have investigated the structure of tidepool fish assemblages on the Danjo Islands, an isolated and uninhabited group of islands located in the northern East China Sea in the western Pacific. Standardised quantitative fish sampling and supplementary visual observation in 2017–2018 revealed that tidepool fish assemblages on the Danjo Islands were characterised by the dominance of Blenniidae, and that species composition was clearly distinct from sites in southern Japan (Ryukyu archipelagos and Kyushu region), while all species were non-endemic, i.e. widely distributed and common in southern Japan. Compared to the survey in the 1970s, the species composition of tidepool fishes on the Danjo Islands appeared to have shifted slightly towards the pattern observed in southern regions during the past half century. Given little or no anthropogenic impact on coastal environments of the Islands, the observed changes in the tidepool fish community are likely to result mainly from temporal variations under the prevailing environmental changes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
43. Livelihood Status of Fishing Communities and Fish Biodiversity of Galachipa River in the Southern Coastal Area of Bangladesh.
- Author
-
Rubel, Md. Rabiul Islam, Pattadar, Shib Nath, Chakma, Suprakash, and Alam, Md Rushna
- Subjects
- *
FISH communities , *FISHING villages , *FISHING nets , *CHILD marriage , *BIODIVERSITY , *FISH populations , *COMMUNITIES - Abstract
The present study was conducted to address the living status of the fishing community and fish biodiversity of the Galachipa River in the Patuakhali district of Bangladesh. For data collection, thirty people involved in fishing activities were interviewed through PRA tools and techniques. Results revealed that 43% of fishermen were young (age < 35). It was found that 90% of fishers were Muslim and 10% were Hindus; among them 53% were illiterate, 30% could only give a signature, and 17% received primary education. Early marriage (between 16 to 20 years) was very common in the fisher community due to illiteracy and unconsciousness. The number of joint family-led fishermen was 70%. Eighty percent utilized huts as dwellings, with an average of 31.45±22.39 decimal land area, including the homestead. In most cases, they received health services from village doctors and rarely from medical doctors. The usual per capita monthly income of the local fishermen was BDT 7160±844.75, while 65% of them possess their own fishing nets and boats. During the study period, 46 fish species under 31 families were identified from the different catches of fishermen, among which four were critically endangered, five were endangered, whereas 17 species were vulnerable. The current study revealed that fishermen of Galachipa River were dependent exclusively on fishing for their food source as they have no alternate earnings. Illiteracy and the lack of both technical knowledge and proper support were the foremost impediments to the uplifting of their sub-standard lifestyle. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
44. A Comprehensive Study on Fish Species Composition, Diversity, Migration, Threatened Status, Economic Value and Endemism in the Co Chien River, Ben Tre Province (Mekong Delta), Vietnam.
- Author
-
Nguyen, Xuan-Dong, Quang, Ngo Xuan, Pham, Thanh Luu, and Veettil, Bijeesh Kozhikkodan
- Abstract
The Mekong River Delta is a hotspot of aquaculture and fish biodiversity. In this study, fish community structure, migration, threatened status and economic value were investigated in the Co Chien River (COR) from August 2017 to July 2019. A total of 3640 fish specimens were collected from 11 sampling stations in the COR. These belong to 133 species of 107 genera of 58 families of 17 orders. The Perch-like order (Perciformes) is the most diverse group, with 65 species accounting for 48.87% of total species collected. The catfish order (Siluriformes) is the second-most diverse group with 15 species (11.28%) and the carps (Cypriniformes) with 14 species (10.53%) is the third. The remaining major groups in the order of diversity are the Herring (Clupeiformes) consisting of 9 species (6.77%) and the Flounder (Pleuronectiformes) consisting of 7 species (5.26%). The remaining orders have number of species varying from 1 to 3 (0.75–2.26%). Among the 133 species recorded, 6 species were considered as Vulnerable category based on the Vietnam Red Data Book (2007). According to the IUCN Red list (2021), 1 species (Coilia mystus) is Endangered (0.75%), 2 species (Maculabatis gerrardi and Pangasius krempfi) are Vulnerable (1.50%), 4 species are Near Threatened (3.01%), 6 species are Data deficient (4.51%), and 76 species are considered as Least concern (57.14%). The results shown that 79 species were migratory fishes (20 species migrated from the upstream and 59 species migrated from the sea), 41 species are endemic species for the MR (30.83% of the total species collected and 23.70% of total endemic species of the MR) and 36 fish species are considered as of local economic value (27.07%). The diversity of fish species was found to be more diverse in the dry season than the wet season, which indicates the influence of river water salinity changes on fish diversity in the region. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
45. Methodology for fish biodiversity monitoring with environmental DNA metabarcoding: The primers, databases and bioinformatic pipelines
- Author
-
Fan Xiong, Lu Shu, Honghui Zeng, Xiaoni Gan, Shunping He, and Zuogang Peng
- Subjects
Environmental DNA ,Fish biodiversity ,Metabarcoding ,Methodology ,Environmental sciences ,GE1-350 ,Biology (General) ,QH301-705.5 - Abstract
Environmental DNA (eDNA) originates from cellular material shed by organisms into aquatic or terrestrial environments and can be sampled and monitored using metabarcoding technology, which is revolutionizing fish biodiversity monitoring. Several reviews concerning fish eDNA have focused on standard sampling methods and its applications, though a systematic review focused on marker genes, databases, and bioinformatic pipelines has not yet been published. Here, we present a comprehensive literature review of studies applying metabarcoding technology to fish eDNA for the purpose of fish biodiversity monitoring. We systematically provide the available universal primers used to amplify barcoding sequences from fish eDNA, and then discuss reference barcoding databases, relevant bioinformatic analyses, as well as developed pipelines. The performances of universal primers and their relevant reference databases are summarized. Combined use of multiple primer pairs targeted for more than one gene marker (e.g., 12S, 16S, Cytb, COI), and use of both local and public databases are recommended as approaches to improve the sensitivity and reliability of fish eDNA analyses. We also compare the effectiveness of eDNA metabarcoding to traditional approaches for monitoring fish biodiversity and highlight challenges and future perspectives associated with this new tool. Ultimately, we advocate for greater incorporation of eDNA analysis into fish biodiversity assessments to assist environmental managers. more...
- Published
- 2022
- Full Text
- View/download PDF
46. Coastal Fish Fauna in the Cystoseira s.l. Algal Belts: Experiences from the Northern Adriatic Sea
- Author
-
Lovrenc Lipej, Danijel Ivajnšič, Valentina Pitacco, Domen Trkov, Borut Mavrič, and Martina Orlando-Bonaca
- Subjects
Cystoseira s.l. forests ,fish assemblage ,fish biodiversity ,habitat preference ,macroalgal belt ,Mediterranean Sea ,Naval architecture. Shipbuilding. Marine engineering ,VM1-989 ,Oceanography ,GC1-1581 - Abstract
Cystoseira s.l. forests are recognised as important habitats which host diverse coastal fish assemblages. Many fish species use such habitats as feeding, breeding, and nursery grounds. Since the coastal fish community depends on the availability of dense macroalgal belts, the decline of these habitats in the Mediterranean Sea also affects the density of coastal fish species. We studied the coastal fish assemblage in Cystoseira s.l. forests in three consecutive years 2019–2021 in the Gulf of Trieste (Adriatic Sea). Data on coastal fish fauna were collected by visual counts conducted by SCUBA diving. Data on algal cover and habitat types were obtained by recording with a video camera. Similarities and differences in the fish community were analysed in terms of habitat and substrate preferences. A total of 34 species were recorded in Cystoseira forests. The results of the present study show that the different algal cover and associated depth gradient have different effects on the fish assemblage in coastal waters, affecting species composition and abundance. For many species, particularly labrids and sea breams, there is a decreasing temporal trend in frequency of occurrence and density. However, fish community trends can be used as a good “proxy” to evaluate the algal belt status. Our results indicate that rapid conservation and restoration actions are needed to stem the decline of Cystoseira s.l. forests. more...
- Published
- 2023
- Full Text
- View/download PDF
47. Fisheries of Egyptian Delta Coastal Wetlands; Burullus Wetland Case Study
- Author
-
Khalil, Magdy T., Barceló, Damià, Editor-in-Chief, Kostianoy, Andrey G., Editor-in-Chief, Hutzinger, Otto, Founding Editor, Negm, Abdelazim M., editor, Bek, Mohamed Ali, editor, and Abdel-Fattah, Sommer, editor more...
- Published
- 2019
- Full Text
- View/download PDF
48. Transboundary Environmental Effects of Hydropower: Fish Community
- Author
-
Yu, Xuezhong, He, Daming, Phousavanh, Phouvin, Yu, Xuezhong, He, Daming, and Phousavanh, Phouvin
- Published
- 2019
- Full Text
- View/download PDF
49. Optimizing the Utilization of Genetic Resources of Indonesian Native Freshwater Fish.
- Author
-
Gustiano, Rudhy, Kurniawan, Kurniawan, and Haryono, Haryono
- Subjects
- *
FRESHWATER fishes , *FISH germplasm , *FISH diversity , *NATIVE fishes , *AQUACULTURE - Abstract
Indonesia has a long story in the documentation of the richness of fish genetic resources. Identifying and documenting the diversity of fish species showing the country has around 1700 species. However, Fishbase records only 1258 species (10% contribution to the world) indicating around unrecorded 442 species (26%) in the site. Significant pressures on fish genetic resources and its habitat, small new species documentation/loss of existing species, a decreasing percentage of species at the global level, and un-optimal utilization seems to be essential issues. To deal with these issues, the re-inventory of Indonesia's freshwater fish genetic resources needs to be conducted with concern on unrecorded data in FishBase and threatened species. The government needs to increase awareness on establishing fisheries status through the implementation of the Ecosystem Approach to Fisheries Management (EAFM) for better fisheries management programs. Improvement of preservation and utilization programs for potential native fish species is also essential to provide alternatives species for aquaculture development and its conservation and the last is habitat rehabilitation through nature reserves empowers rules and strengthens regulation. To achieve action plan targets, cross-sectoral coordination is needed in which institutions involved in policy authority, scientific authority, and management authority must synchronize their programs and actions. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
50. Comparative analysis of bottom trawl and nanopore sequencing in fish biodiversity assessment: The sylt outer reef example.
- Author
-
Kasmi, Yassine, Neumann, Hermann, Haslob, Holger, Blancke, Tina, Möckel, Benita, Postel, Ute, and Hanel, Reinhold
- Subjects
- *
DREDGING (Fisheries) , *BIODIVERSITY , *MARINE parks & reserves , *DNA data banks , *HARBOR porpoise , *FISH diversity , *REEFS , *IDENTIFICATION - Abstract
The assessment of fish diversity is crucial for effective conservation and management strategies, especially in ecologically sensitive regions such as marine protected areas. This study contrasts the effectiveness of environmental DNA (eDNA) metabarcoding analysis employing Nanopore technology with compare beam trawl surveys at the Sylt Outer Reef, a Natura 2000 site in the North Sea, Germany. Out of the 17 fish species caught in a bottom trawl (using a 3m beam trawl), 14 were also identified through eDNA extracted from water samples. The three species not detected in the eDNA results were absent because they lacked representation in public DNA databases. The eDNA method detected twice as many fish species as the beam trawl, totalling 36 species, of which 14 were also detected by the trawl. Additionally, the selection of primers (Mifish) facilitated the identification of one marine mammal species, the harbour porpoise. In conclusion, the findings underscore the potential of eDNA coupled with MinION sequencing (Long read technology) as a robust tool for biodiversity assessment, surpassing traditional methods in detecting species richness. • Employing eDNA metabarcoding analysis using nanopore technology to assess fish biodiversity in the North Sea. • eDNA demonstrates high compatibility with traditional trawling methods. • Long-read sequencing technologies yield results comparable to trawling surveys. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.