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Indonesia is a country whose territory consists of thousands of islands, most of which consist of waters and the rest are land. The ocean area is divided into territorial seas of 12 nautical miles, adjacent seas of 24 nautical miles, and an Exclusive Economic Zone of 200 nautical miles, measured from baseline of Indonesia. The total area of Indonesia reaches 7.7 million km2, with a sea area of 3.2 million km2, consisting of 2.8 million km2 of inland waters, and 0.3 million km2 of territorial waters, and 2.7 million km2 of the Indonesian Exclusive Economic Zone (ZEEI). In this study, the focus of attention is on fishing in ZEEI waters, which is carried out by foreign fishing vessels. The fact of fishing by foreign fishermen is indeed an unavoidable reality. From a legal perspective, fishing in the waters in ZEEI area is a criminal act or what is known as a fisheries crime. This is because fishing by foreign fishermen violates the provisions of fishing permits in Indonesia. Against these fisheries crimes, Indonesia as a sovereign country has the authority to supervise, secure, in the ZEEI area, and also has the authority to take action against foreign flag vessels that fish in the ZEEI area. The territory of Indonesia, most of which is approximately two-thirds ocean, contains enormous natural wealth, especially fishery resources. These fishery resources trigger foreign fishermen to commit fish theft, especially in the ZEEI area. As a sovereign country, Indonesia has full authority to enforce the law against criminal acts in the ZEEI area. Based on provisions of Article 69 paragraph (4) of Law No. 45 of 2009, Indonesia can impose sanctions on foreign-flagged fishing vessels by sinking vessels. [ABSTRACT FROM AUTHOR]

ABSTRACT Species distribution models (SDMs) are critical to the adaptive management of fisheries under climate change. While many approaches projecting marine species range shifts have incorporated the effects of temperature on movement, there is a need to incorporate a wider suite of ecologically relevant predictors as temperature‐based SDMs can considerably under‐ or over‐estimate the rate of species responses to climate shocks. As a subarctic ecosystem at the sea ice margin, the Eastern Bering Sea (EBS) is warming faster than much of the global ocean, resulting in the rapid redistribution of key fishery and subsistence resources. To support long‐term planning and adaptation, we combine 40 years of scientific surveys with a high‐resolution oceanographic model to examine the effects of bottom temperature, oxygen, pH and a regional climate index (the extent of the EBS ‘cold pool’) on range projections through the end of the century. We use multimodel inference to partition uncertainty among earth systems models, climate scenarios and distribution model parameterizations for several ecologically and economically important EBS groundfish and crabs. Covariate choice is the primary source of uncertainty for most species, with models that account for spatial responses to the cold pool performing better and suggesting more extensive northward movements than alternative models. Models suggest declines in the probability of occurrence at low pH and oxygen concentrations for most species. We project shifts that are directionally consistent with, yet larger than those previously estimated for most species, suggesting that accounting for large‐scale climate variability in species distribution models may substantially alter range projections. [ABSTRACT FROM AUTHOR]

ABSTRACT Estuarine fisheries are of high regional socio‐economic importance worldwide, by providing an important livelihood for many families. The Portuguese green crab (Carcinus maenas) fishery was assessed using a socio‐economic assessment to understand the importance of the fishery and a stock assessment analysis to determine the exploitation status of the fishery during 1960–2020. Fisher knowledge revealed that crab fishing was a family affair that provided a livelihood for hundreds of families directly targeting crabs, with catches exported to Spain during 1960–1990s, and in later years, crab demand increased as bait for octopus fishing. Despite its socio‐economic importance, the fishery was regulated without a scientific basis and economic value of crabs remained similar through time. Annual landings never exceeded sustainable catch rates, but engagement in the crab fishery declined due to low economic value of crabs compared to other fisheries and regulatory hurdles. Consequently, the number of fishermen declined to 20–30 elderly men fishing on the largest estuaries, with the fishery currently on the verge of extinction. Fishers pointed to a reduction in the minimum landing size and enforcement of crab‐specific trap regulations as ways to avert fishery decline. Such changes would stimulate recruitment of new crab fishers, while reducing fishing pressure on other estuarine resources through fisheries diversification. [ABSTRACT FROM AUTHOR]

The changes in fish community structure hold profound implications for our under-standing of the stability and sustainability of marine ecosystems. To uncover the evolving trends in the fish community structure of the Wailingding marine ranching area, this study analyzed fishery resource survey data collected in April 2020 and March 2023, employed methods such as the relative importance index, Bray–Curtis clustering, similarity percentage (SIMPER) analysis, biomass spectrum, ABC curves, and redundancy analysis to analyze the interannual changes and stability characteristics of fish community structure in spring. The results indicate that 26 and 62 fish species were captured in spring 2020 and 2023, respectively, with Thrissa kammalensis and Leiognathus ruconius merging as the dominant species in each year. In 2020, warm water, upper-middle fish species predominated, followed by a shift to warm water, demersal, and benthic species in 2023. Cluster analysis revealed distinct spatial patterns, with fish communities in both years divisible into three discernible groups. SIMPER analysis identified T. kammalensis in 2020 and L. ruconius in 2023 as the main typical species of the fish communities, with Pampus argenteus and Dasyatis zugei as the primary discriminating species between communities, respectively. The slopes of the standard biomass spectra for both year were less than -1, indicating a decline in the overall biomass of the fish community, particularly among larger-bodied species. ABC curve analysis indicated that the fish community in spring 2020 was in a state of moderate disturbance (W=0.225), while in spring 2023, it was in a state of severe disturbance (W=-0.145). The primary environmental factors influencing fish community distribution in both springs were water temperature, depth, and salinity. In summary, the Wailingding marine ranching area has experienced a transition in dominant fish species towards smaller forage fish species, typified by L. ruconius. The level of disturbance experienced by fish communities is progressively intensifying, leading to a decline in the structural stability. Concurrently, there has been an increase in the biomass of reef-associated and reef-dependent fish species. [ABSTRACT FROM AUTHOR]

ABSTRACT We estimated relative abundance of South Atlantic Swordfish (Xiphias gladius), a highly migratory marine species, from commercial fishing data using a three‐step analysis protocol. First, we modeled catch rate based on variables affecting the catch rate to rule out effects of catchability‐related factors. Next, we analyzed residuals to identify autocorrelation. Last, we used an area‐weighed recursive algorithm that considered spatial autocorrelation for each year within the analysis period. Commercial South Atlantic swordfish catch data from the Brazilian pelagic longline fleet were analyzed. Swordfish accounted for the highest spatial dependence in distance in 2005 (456 km), 2008 (111 km), 2012 (80 km), and 2014 (443 km), as well as for the lowest in 2011 and 2013 (average = 15.45 km). A downward trend in swordfish abundance between 2010 and 2017 was detected several years earlier than conventional standardized indices, so our proposed index is an alternative, and potentially more accurate, index of swordfish population dynamics in the South Atlantic. Our findings highlight the need to integrate multiple approaches into assessments of the abundance of marine species. [ABSTRACT FROM AUTHOR]

The Yangtze River Estuary is the traditional habitat of fishery resources in China and also one of the crab fishing sites, but nowadays the crab resources have been seriously affected by high-intensity anthropogenic disturbance. To understand the composition and diversity of crab community following the fishing ban, six surveys were conducted from August 2022 to November 2023 using the single-bag trawl method. This study examined the crab community composition, biodiversity, resource density, spatiotemporal distribution patterns, and main influencing factors. Results indicated that a total of 14 crab species lived in the Yangtze River Estuary. Matuta planipes and Portunus trituberculatus were dominant crabs in summer 2022. P. trituberculatus , Eriochier leptognathus , and Charybdis japonica were dominant crabs in autumn 2022. Then, E. leptognathus and Eriocheir sinensis were dominant crabs in winter 2023. Notably, the largest numbers of dominant crabs appeared in spring 2023, including M. planipes , P. trituberculatus , E. leptognathus , C. japonica , and E. sinensis. Three same dominant crabs (M. planipes , P. trituberculatus , C. japonica) were identified in the summer and autumn of 2023. Thereinto, P. trituberculatus was the most dominant crab. The abundance and biomass trends of estuary crabs were winter< spring< autumn< summer. The community diversity index, evenness index, and richness index were winter< summer< autumn< spring, indicating the seasonal changes in abundance, biomass, and biodiversity. Correlation and redundancy analysis revealed that dissolved oxygen and salinity were the most critical environmental factors, which affect the changes in crab community in the estuary. This study revealed the changing characteristics of crab resources in the Yangtze River Estuary after the fishing ban, and provided the essential data and scientific basis for resource conservation and management decisions. [ABSTRACT FROM AUTHOR]

The south-central coastal waters of Bangladesh are recognized as one of the foremost aquatic biodiversity hotspots despite severe anthropogenic and environmental hazards to natural fishery resources. Therefore, this study was undertaken to examine the current status of fish faunal diversity and evaluate the condition and conservation status of fish in the rivers spanning the south-central coastal region of Bangladesh. During the research period, spanning from July 2021 to February 2022, a total of 105 fish faunal species belonging to 84 genera, 50 families, and 14 orders were documented. The order Perciformes (27.62%) was found to be the most diverse fish group, followed by Cypriniformes and Scombriformes (12.38%), Siluriformes and Clupeiformes (11.43%), Synbranchiformes and Pleuronectiformes (3.81%). According to the International Union for Conservation of Nature (IUCN) Red List classification, 52 species recorded from the studied areas were determined to be of Least Concern, while 11 species were Vulnerable, 14 species were classified as Endangered, and 7 species are recognized as Critically Endangered. In order to assess the species diversity, richness, and evenness of the fish assemblage in the sampling areas, four diversity indices, viz. the Shannon-Wiener index (H), Simpson's dominance index (D), Simpson's index of diversity (1-D), and Margalef's index (d), were applied. Their overall values were 3.39–3.59, 0.05–0.07, 0.95–0.94, and 7.67–8.75, respectively. All of the species were more or less evenly distributed throughout the three sites, with Kalapara having the most even distribution. Several anthropogenic and natural attributes that contribute to decline in fish diversity were recorded using a survey questionnaire which revealed that management and conservation measures should be taken with utmost urgency. [ABSTRACT FROM AUTHOR]

Lane snapper Lutjanus synagis (Linnaeus 1758) is abundant in Northeastern Brazil and economically relevant to the artisanal fishery. Population and reproductive aspects of lane snapper wereinvestigated to assist assessment. Lane snappers were acquired in Pernambuco (n = 406) from 2013 to 2015. Sex ratio is close to 1 : 1 (213 males and 179 females). For males, the total length, TL (mode) ranges from 16.3–27.8 cm (20.4 cm). For females, TL ranges from 17.0–29.9 cm (21.0 cm). The species have negative allometric growth (b < 3). The length that 50% of the population reach maturity (L50) using TL is 17.7 cm for both sexes. Macroscopical and microscopical gonadal stages are described per sex, and the gonadosomatic index indicates that reproduction happens during the dry season, between September and March, and two maturational peaks are observed, the first between September and November and the second between January and March. [ABSTRACT FROM AUTHOR]

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

The blue economy is one of the leading sectors in Indonesia, especially fisheries. This research was conducted in three coastal cities/regencies: Semarang City, Demak Regency, and Kendal Regency, Central Java Province, Indonesia. This study examines the factors for fisheries activities topics, both aquaculture in inland water and fish capture in marine fisheries, namely: Gross Regional Domestic Product (GRDP) in each district capital in the aquaculture business, fisheries human resources, production and production value of capture fisheries, production, and production value, volume, production value of aquaculture and water quality which plays a role in increasing aquaculture yields. The secondary data are from the Central Bureau of Statistics (Badan Pusat Statistic (BPS)) and the Indonesian Ministry of Maritime Affairs and Fisheries (Kementerian Kelautan Perikanan (KKP)). The survey data used were from 2018 to 2023, with the following subjects covered it is (1) GRDP, (2) capital in aquaculture, (3) labor, (4) production of capture, (5) production of value fisheries source by data the result of fish value (Indonesian rupiah (IDR)), (6) production of aquaculture, (7) volume (kg) production of aquaculture, (8) value (IDR) production of aquaculture. The results of this study indicate that these factors are closely related to the yields of aquaculture activities. GRDP is a factor that specifically influences the outcomes of fisheries; in the analysis of the average fisheries activity in the last 5 years, Semarang City was 5.24%, Kendal Regency at 4.95%, and Demak Regency at 2.09%; furthermore, it can be concluded that fisheries activities, namely aquaculture and marine capture, have increased per year. The implications of aquaculture production results for the blue economy that stakeholders can use to implement policies are increasing economic contribution. Increased production will create new jobs, strengthen supply chains, and increase income for people involved in the fisheries industry. [ABSTRACT FROM AUTHOR]

Fish segmentation in underwater videos can be used to accurately determine the silhouette size of fish objects, which provides key information for fish population monitoring and fishery resources survey. Some researchers have utilized underwater optical flow to improve the fish segmentation accuracy of underwater videos. However, the underwater optical flow is not evaluated and screen in existing works, and its predictions are easily disturbed by motion of non-fish. Therefore, in this paper, by analyzing underwater optical flow data, we propose a robust underwater segmentation network, RUSNet, with adaptive screening and fusion of input information. First, to enhance the robustness of the segmentation model to low-quality optical flow inputs, a global optical flow quality evaluation module is proposed for evaluating and aligning the underwater optical flow. Second, a decoder is designed by roughly localizing the fish object and then applying the proposed multidimension attention (MDA) module to iteratively recover the rough localization map from the spatial and edge dimensions of the fish. Finally, a multioutput selective fusion method is proposed in the testing stage, in which the mean absolute error (MAE) of the prediction using a single input is compared with that obtained using multisource input. Then, the information with the highest confidence is selected for predictive fusion, which facilitates the acquisition of the ultimate underwater fish segmentation results. To verify the effectiveness of the proposed model, we trained and evaluated it using a publicly available joint underwater video dataset and a separate DeepFish public dataset. Compared with the advanced underwater fish segmentation model, the proposed model has greater robustness to low-quality background optical flow in the DeepFish dataset, with the mean pixel accuracy (mPA) and mean intersection over union (mIoU) values reaching 98.77% and 97.65%, respectively. On the joint dataset, the mPA and mIoU of the proposed model are 92.61% and 90.12%, respectively, which are 0.72% and 1.21% higher than those of the advanced underwater video object segmentation model MSGNet. The results indicate that the proposed model can adaptively select the input and accurately segment fish in complex underwater scenes, which provides an effective solution for investigating fishery resources. [ABSTRACT FROM AUTHOR]

ABSTRACT Aquatic protected areas and co‐management have been proposed as strategies for conserving fisheries resources in several world regions. We analyzed the effects of different levels of governance on yield of experimental fisheries in Amazonian floodplain lakes. Sampling between 2018 and 2022 used gill nets deployed for 24 h during flooding and receding water phases. Generalized linear models (GLMs) were fitted to catch per unit effort (CPUE) and covariates, river level, time, sampling sites, level of management of the collection sites, and lake fishery management type. CPUE was significantly related to governance, management type, sampling site, and water level. Our results indicated that areas of sustainable use where community‐based co‐management was implemented were more effective for promoting high fishery yield. [ABSTRACT FROM AUTHOR]

Fishery stock assessment is the basis of fishery management. This study explored the applicability of the Length-Based Spawning Potential Ratio method (LBSPR) to assess the exploitation status of data-limited fisheries. Using data from bottom trawl surveys in Zhanjiang Bay, the study estimated the relative fishing mortality (F/M) of Johnius belangerii stock. The results showed that the average lengths at 50% and 95% selectivity (LS50 and LS95) were 105 mm and 145 mm, respectively, both of which are smaller than the lengths at 50% and 95% sexual maturity length (L50 = 125 mm and L95 = 167 mm) determined via the logistic curve. The estimated spawning potential ratio (SPR) was 0.15 significantly below the reference threshold of 0.2. The study recommended the establishment of a minimum size range (137 to 150 mm) length for harvesting Johnius belangerii to enhance their reproductive potential. It also emphasized the importance of scientific monitoring of fishery resources and the ecological environment in Zhanjiang Bay to ensure sustainable management. [ABSTRACT FROM AUTHOR]

Climate change is affecting marine ecosystems altering the distribution and abundance of organisms, with implications for fisheries and food security. This warming-induced reshuffle in species abundance could bring threats and opportunities to the fisheries, but needs to be assessed to promote effective actions and to foster resilience. We analyzed the density and distribution patterns of deep-sea rose shrimp (Parapenaeus longirostris), as well as identified the main environmental have identified the environmental drivers shaping its habitat along the western Mediterranean (Iberian Peninsula) during the period 2001–2020. Using spatial distribution models developed concurrently with an ensemble of four Regional Climate Models (RCMs), we have projected the density of this species during the next century under two climate scenarios (RCP4.5 and RCP8.5). Bathymetry and sea bottom temperature drove the density of the species, leading to a marked northward expansion during the last two decades. Our results projected an increase in its distribution and especially in density throughout the area along the 21st century, mirroring the effect of global warming. Consequently, the most distant period (i.e. 2100s) and the warmest scenario (RCP8.5) presented also the highest densities and low internal variability of the ensemble. We discussed the power of assessing uncertainties using a RCM ensemble, particularly under complex oceanographic features, to bring robust information for an effective scientific advice to fisheries management. [ABSTRACT FROM AUTHOR]

ABSTRACT Shifts in species distribution have far‐reaching implications across ecological, economic, and social dimensions. Pelagic fish, integral to global fisheries, have displayed notable euryhaline and eurythermal characteristics. However, a poleward range expansion trend has emerged in the northern hemisphere for certain Scomber species since the 2010s, attributed to sea surface temperature and food resource dynamics. Scomber colias, a principal pelagic fishery resource in Argentina, stands as an underexploited species with recent landings totaling approximately 14,800 tons. In the North Patagonian shelf waters, where S. colias resides at its southern distribution, there has been documented ocean warming. In this context, this study evaluates potential changes in the distribution and abundance of S. colias from 1991 to 2022 in the Southwestern Atlantic Ocean (SAO). Drawing on two distinct data sources, the analysis reveals a poleward range expansion, extending to 48°5′S, exceeding historical limits by 278 km. This expansion is positively correlated with rising sea surface temperatures, with the most significant displacement observed during summer, when this species has a high feeding activity in the study area. The investigation further explores the relationship between S. colias presence and the abundance of its primary prey species between 2011 and 2022. This is highly possible, yet no significant results were uncovered. This study marks the first documented southward range expansion of S. colias in the SAO, providing essential quantitative insights for biological studies, fisheries management, and the canning manufacturing industry. The latter could benefit from year‐round access to fish, potentially generating employment opportunities and fostering economic growth within the local community. [ABSTRACT FROM AUTHOR]

ABSTRACT Recreational fisheries are dynamic social‐ecological systems. Identification of anticipated future trends supports the design of policies and management to deliver outcomes for fisheries resources, users, and communities. To this end, we applied a forecasting method (i.e., Delphi survey) to recreational fisheries in five Nordic countries. The survey consisted of three rounds and included 20 diverse experts from each country. The study focused on expert perceptions of future trends in angler behaviors linked to specific angling activities (e.g., gear used, species targeted), and more general behavior (e.g., social media use, stewardship). Experts unanimously expected increases in fly fishing, stewardship, and use of angling‐related technologies and social media platforms in the upcoming decade. Results can guide future research, management, and collaboration related to recreational fishing in the Nordic countries and beyond. [ABSTRACT FROM AUTHOR]

Grimothea monodon, an important fishery resource in the Humboldt Current marine ecosystem (HCE), present two contrasting morphotypes (PM, pelagic morphotype; BM, benthic morphotype). The fishery management of G. monodon is focused on understanding only fishery aspects that apply to a limited area, and there are currently no studies that evaluate the nutritional status of these morphotypes. This study evaluated the biological performance of PM and BM, analyzing the body (size, CL; weight, W; condition factor, Kn) and biochemical condition (glucose, G; proteins, P; lipids, L; fatty acids, FAs). The results reveal that G. monodon showed differences in CL and W between morphotypes, with higher values in BM than PM. The Kn was different between morphotypes with a tendency of isometric growth. In turn, the G contents were higher in PM than BM, while the contents of P, L, and FAs showed an opposite tendency, with higher contents recorded in BM than PM. Our findings suggest that the Kn should be included to strengthen the biological parameters and their relationships used in fishery management models. Differences in the biochemical condition between morphotypes can be considered potentially adaptive, in response to the combined effect of environmental factors that vary in the HCE. [ABSTRACT FROM AUTHOR]

Marine biodiversity is increasingly threatened by overfishing and marine pollution. A comprehensive understanding of the biodiversity in the Yellow and Bohai Seas is essential for resource conservation. This study conducted a large-scale survey of fishery resources in the Yellow and Bohai Seas to investigate fish community structure and diversity using eDNA technology. The results showed that 57 and 65 fish species were recorded in spring and summer, respectively, with 46 species identified in both seasons. A total of nine dominant species were identified in spring, mainly belonging to Perciformes, while seven dominant species were identified in summer, primarily from Clupeiformes. In different regions, no significant differences in fish α diversity were observed between spring and summer. However, significant seasonal differences were found in both α and β diversity. At the spatial level, fish species in the Yellow and Bohai Seas occupied similar ecological niches. However, at the temporal level, there are certain differences in the ecological niches of fish communities between seasons. Phylogenetic diversity showed no significant differences at the spatial scale, yet notable seasonal variations were observed at the temporal scale, with spring (661.46) significantly exceeding summer (540.30). The Mantel test indicated that nitrate and salinity were key environmental factors influencing α diversity. RDA analysis revealed that the dominant species in spring were mainly influenced by chlorophyll-a and water temperature, while those in summer were mainly affected by water depth, nitrite, water temperature, and salinity. [ABSTRACT FROM AUTHOR]

The abundance of fishery resources significantly impacts the ratio of fishing effort to harvest. However, traditional statistics of fishery catches or commonly used catch per unit effort (CPUE) metrics cannot accurately capture the complexity of resource abundance in the ocean. To address this issue, we propose here a novel approach that integrates the actual fishery catch from vessel logs with fishing duration obtained through automatic identification system (AIS) positioning. This combined analysis eliminates confounding factors and introduces a novel metric called "catch efficiency (CE)" to evaluate fishing operations more accurately, thereby reflecting resource abundance in a more reasonable way. In this study, we focus on the CE of squid in the Oyashio Extension region in the Northwestern Pacific. Our analysis reveals significant temporal and spatial variations of CE, manifesting in both intensity and distribution patterns. Moreover, our findings establish a close relationship between CE and background water mass distribution, chlorophyll‐a concentration, and micronekton biomass. This implies that the resource abundance of squid can be inferred by considering the varying environmental factors within the fishing area. [ABSTRACT FROM AUTHOR]

Cryopreservation of spermatogonia could be a useful tool to preserve the genetic resources of fish, which could be further restored via germ cell transplantation. In this study, the protocol for the cryopreservation of the spermatogonia of Asian sea bass (Lates calcarifer), an economically important fishery resource in the Indo-West Pacific, was optimised. The impact of the cryopreservation technique on cell viability and apoptosis, expression of several genes related to immature germ cell markers, transplantability in allogeneic recipients, and global DNA methylation was evaluated. The slow-freezing method was performed for the cryopreservation of immature testis tissue, which contains a high proportion of spermatogonia. The optimal condition that yielded the highest recovery rate of post-thawed spermatogonia included a cryomedium containing Leibovitz's (L-15) medium and 10 % dimethyl sulfoxide, ice equilibration for 60 min before freezing, and subsequent thawing at 4 °C for 8 min. Moreover, a higher number of early and late apoptotic cells was detected in the cryopreserved than in the fresh testes, suggesting that apoptosis could result in reduced viability. The expression levels of dazl decreased in the cryopreserved testes; however, there were no significant differences in the expression levels of nanos2 or nanos3 between the fresh and cryopreserved testes. Although qRT-PCR showed lower vasa expression in cryopreserved testicular cells, in situ hybridisation showed expressed vasa in the cryopreserved testicular cells. Post-thawed spermatogonia could be incorporated into the genital ridge of allogeneic recipients, suggesting that cryopreserved spermatogonia exhibit transplantability characteristics. Compared with fresh testes, significant changes in the proportion of DNA methylation (decreased 5-mC and 5-caC) were observed in cryomedium-free testicular cells, whereas those of the cryopreserved cells were not significantly different. Therefore, the method we developed for the cryopreservation of the spermatogonia of Asian sea bass enabled post-thaw cells to retain several stemness characteristics and maintain their epigenetic stability. • Cryopreservation of the spermatogonia of Asian sea bass was optimised. • Cryopreserved spermatogonia exhibit transplantability characteristics. • Our method enabled post-thaw cells to retain several stemness characteristics. • Post-thaw cells maintained their epigenetic stability through our method. [ABSTRACT FROM AUTHOR]

Copyright of JFMR - Journal of Fisheries & Marine Research is the property of Brawijaya University 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.)

Copyright of Marine Fisheries: Jurnal Teknologi & Manajemen Perikanan Laut is the property of IPB University 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.)

The consumption of aquaculture products and, in turn, the importance of the aquaculture industry are increasing with the depletion of global fishery resources. In the flow-through aquaculture systems used in Korea, olive flounders are overcrowded near the central outlet, causing stress, and the sharp central outlet hole injures the olive flounders. Therefore, in this study, we propose a central outlet cap that can prevent overcrowding and injuries in olive flounders near the central outlet in a flow-through aquaculture system. An L27(35) orthogonal array was constructed using five central outlet cap design variables, and computational fluid dynamics (CFD) analysis was performed for each experimental point. The pressure drop between the tank inlet and the central outlet was evaluated, and the experimental point with the highest pressure drop was identified. In addition, the internal fluid velocity of the experimental point with the highest pressure drop value was confirmed to be improved compared to the initial flow-through aquaculture system. The central outlet cap designed in this study is expected to be economically beneficial to aquaculture by reducing the overcrowding of olive flounder and preventing injury to olive flounder while improving the internal fluid velocity. [ABSTRACT FROM AUTHOR]

The study quantitatively assesses the hydrological alterations induced by the Luv Kush Barrage on the Ganga River, India, using the Range of Variability Approach (RVA) to analyze changes in flow conditions before and after the barrage construction. The Ganga River, a crucial water source for millions, has experienced significant hydrological changes due to human interventions, notably the construction of the Luv Kush Barrage. Employing indicators of hydrological alteration (IHAs), we compared pre-impact (1972–1994) and post-impact (2001–2014) flow data to ascertain the barrage's effects on the river's flow regime. Our findings reveal significant alterations in the magnitude of monthly streamflow, especially during the monsoon season, with notable decreases in July, August, and September. Alterations were observed in the annual extreme flow conditions, frequency, and duration of high and low pulses, indicating a comprehensive impact on the river's natural flow patterns. These alterations affect the river's ecological health, affecting aquatic habitats, fishery resources, and community livelihoods dependent on the river. The study underscores the necessity for integrated water resource management practices that consider the ecological and socio-economic implications of hydrological alterations. [ABSTRACT FROM AUTHOR]

Artificial reefs are widely recognized for their role in improving the ecological environment and creating protected habitats for marine organisms, ultimately enhancing biodiversity within the food web and fisheries resources. This study utilizes stable isotopes to analyze fish samples ranging from 3.4 to 1067 g in body mass, collected within the artificial reef area of Haizhou Bay. The objective is to determine if the δ15N-based fish body mass acts as a driving factor in shaping the food web structure. The results showed a certain level of overlap among all trophic guilds, suggesting that most trophic guilds within this region share similar living environments and feeding habits. The multiple linear regression showed a slight increasing trend between δ15N values and body mass. Furthermore, the predator–prey mass ratio (PPMR) was calculated to be 430:1 based on the δ15N–body mass relationship. This implies that larger reef fish within this artificial reef ecosystem tend to have higher δ15N values compared to smaller fish, indicating a shorter food chain in this ecosystem. In summary, this analysis provides valuable insights into the fish community structure within artificial reef ecosystems. Therefore, it is recommended that future studies focus on further characterizing the fish community structure using body mass information. [ABSTRACT FROM AUTHOR]

ABSTRACT Beaches are among the world's most important coastal ecosystems, within which surf zones are crucial providers of essential ecosystem services to humans. We completed the first estimate of current and potential monetary value of fishery resources in surf zones of beaches on the southwestern Iberian Peninsula. Over 1 year, five beaches in the Gulf of Cádiz were sampled using a beach seine. For monetary valuation, average first‐sale prices were used, with a capital update based on the Consumer Price Index (CPI). The 189.16 kg of 38 commercial species captured had a potential monetary value (PMV) of 408.63 €/ha. The annual value of adult fish (19 species) averaged 115.05 €/ha and juvenile fish (33 species) averaged 293.58 €/ha. Our findings highlight the value of surf zones and beaches as fishery resources, similar to other marine ecosystems. Our findings are useful for ongoing monitoring and research to enhance knowledge of these areas and the array of ecosystem services they provide. [ABSTRACT FROM AUTHOR]

Overfishing, bycatch, and other anthropogenic threats may lead to the destruction of fragile habitats and substantial losses of marine life. Marine fishery resources can be protected by adjusting fishing intensity and establishing marine reserves. Currently, China adopts the closed fishing seasonmanagement approach to protect traditional fishing grounds, where fine spatio-temporal prediction is essential to efficiently supervise the wide scope. Fishing vessel behaviors reflect fishers' experience as well as the information provided by fish detection radar, while the fishery resource distribution is relevant to the marine environment. In this study, we identified fishing vessel behaviors (gillnets, trawls, purse seines, and abnormal behaviors) and qualitatively assessed and predicted fishing time of different fishing vessel behaviors to search for high intensity fishing operation areas by constructing a time-space prediction model. The model was based on big data of fishing vessel automatic identification systems and3 the marine environment, and was verified in the East China Sea. The prediction results generally corresponded with the distribution of traditional fishery resources in the East China Sea and the fishing efforts provided by the Global Fishing Watch. This model can provide an accurate and effective refined fishing vessel operation time prediction, and benefits fishing management and fishery resources protection. [ABSTRACT FROM AUTHOR]

Simple Summary: Recent awareness highlights the significant impact of contaminants on the Mediterranean marine ecosystem and fishery resources. Monitoring these pollutants is crucial due to their accumulation in marine organisms and the health risks they pose through consumption. This study examines the levels of total mercury and PAHs in the muscle tissue of European hake from an important fishing ground in the Adriatic Sea. Seasonal and gender patterns as well as correlations with somatic indexes were explored to provide cost-effective bioindicators for pollution monitoring and mitigation. This research investigates the dynamics of contaminant exposure in European hake (Merluccius merluccius, L. 1758) from the Adriatic Sea (Central Mediterranean Sea) by examining the levels of total mercury (THg) and polycyclic aromatic hydrocarbons (PAHs) in the muscle fish tissues. The study explores the correlations between these pollutants and somatic indexes to identify the early warning signals of pollution and ecological effects. The levels of pollutants are influenced by season and sex. Lipids appear to have a minimal effect on the PAH levels, whereas they exhibit a positive correlation with mercury levels in the muscle. No significant relationships between the pollutants and condition indexes were observed, except for a positive correlation between THg and the gonadosomatic index, indicating a potential impact on the reproductive health of fish. In contrast, PAHs showed no meaningful correlation with condition indexes. Differences in contaminant accumulations and lipid levels between sexes reflect variations in metabolic activity, reproductive costs, and adaptive strategies to seasonal changes and energy demands. This study highlights the importance of long-term monitoring to improve pollution management, environmental conservation, and the protection of marine organisms' health. [ABSTRACT FROM AUTHOR]

This study aims to explore the spatial distribution of false kelpfish (Sebastiscus marmoratus) in the mussel farming area, artificial reef areas of Gouqi Island (Shengsi, China), and natural areas using eDNA detection methods. Surface and bottom water samples were collected at 12 stations in November 2022 and April 2023, totaling 52 samples. We used species-specific primers and probes for quantitative PCR (qPCR) detection of Sebastiscus marmoratus eDNA. The eDNA concentrations differed seasonally (p < 0.05) and did not differ (p > 0.05) among the three sampling areas and two water layers. The greatest eDNA concentrations occurred in the surface layer during the spring. Higher concentrations of Sebastiscus marmoratus eDNA were also found in the mussel aquaculture area. Temperature exhibited a significant positive correlation with Sebastiscus marmoratus eDNA concentration (p < 0.05). Additionally, we developed linear equations predicting the relationship between environmental factors and environmental factors, providing a reference for future fishery resource surveys. [ABSTRACT FROM AUTHOR]

Small-sized fish are a vital food source for large predatory commercial fish and play a key role in marine food webs, bridging lower and higher trophic levels. They are indispensable in maintaining the energy flow and material cycling within aquatic ecosystems. This study utilized bottom-trawl survey data from 2017 to 2020 along the south inshore of Zhejiang, China, complemented by concurrent environmental data, to examine the influence of environmental factors on the resource density and seasonal distribution patterns of four dominant small-sized fish species. The research findings indicated that SSH (sea surface height) and Chl (chlorophyll-a concentration) emerged as the key environmental factors influencing resource densities, with all four species exhibiting similar preferences toward these variables. However, significant disparities were observed in their preferences for SST (sea surface temperature), SSS (sea surface salinity), and DO (dissolved oxygen). The various species' resource density and distribution patterns underwent significant seasonal variations. Additionally, the seasons and regions with the highest resource densities consistently aligned, occurring predominantly in autumn within the northern waters of the study area. This research further elucidated the environmental predilections and seasonal spatial distribution traits of small-sized fish in the south inshore of Zhejiang, an important feeding ground for economic fish species in the East China Sea. This provides scientific backing for forecasting alterations in coastal fishery resources under environmental and climate change scenarios and supports ecosystem-based fisheries management strategies. [ABSTRACT FROM AUTHOR]

Climate change has increasingly impacted the marine environment, with various marine environmental factors interacting to influence fish distribution. Assessing the impact of climate change on the future distribution of fish depends on understanding how biological responses interact with environmental conditions. Enhancing our understanding of the potential impacts of climate change is crucial for the sustainable development of marine fisheries. In this study, we analyzed the habitat suitability of Scomber japonicus and Konosirus punctatus in the coastal waters of China (17°–41° N, 107°–130° E) using marine environmental data, including, as follows: sea surface temperature (SST); sea surface salinity (SSS); pH; and biological occurrence data from 2000 to 2010. A maximum entropy (MaxEnt) model was employed to predict the future distribution of these two species based on the shared socioeconomic pathway (SSP) scenarios for 2040–2050 and 2090–2100. The results indicate that climate change will significantly affect the future habitat distribution of S. japonicus and K. punctatus, leading to a decrease in suitable habitat areas offshore China and a gradual shift northeastward in the center of these habitats. These findings are essential for understanding the impacts of climate change on the distribution of S. japonicus and K. punctatus, with significant implications for fisheries resource assessment and management. [ABSTRACT FROM AUTHOR]

This study elucidated the composition and diversity characteristics of the main fish species in the Pingzhai Reservoir by collecting and analyzing environmental DNA (eDNA) samples from the reservoir and comparing them with data from traditional fishery resource surveys. The results showed that eDNA technology detected 43 fish species spanning 37 genera, 5 orders, and 11 families. Importantly, no significant difference in fish diversity was observed among the surveyed sites, and the potential of eDNA technology in studying fish diversity in the Pingzhai Reservoir was discussed. A total of 29 species distributed across 18 genera, 3 families, and 3 orders were captured using traditional resource surveys. Overall, 21 fish species were detected using both methods, constituting 48.8% of the total fish population. Cypriniformes were the most prominently detected order in both methods. Among all the fish species, the most abundant in the Pingzhai Reservoir were the free-range fish species Hypophthalmichthys molitrix and Hypophthalmichthys nobilis, which have the largest sequence abundance in the eDNA investigation, in addition to the detection of exotic species, such as Micropterus salmoides and Oreochromis niloticus. Compared with traditional investigation methods, eDNA technology offers several advantages, including high sensitivity, minimal ecological impact, superior data accuracy, and low cost, making it suitable for fish diversity research in fishery resources investigations. This study enhances our understanding of fish diversity in the Pingzhai Reservoir and provides crucial basic information to support the ecosystem management and restoration efforts of the reservoir. [ABSTRACT FROM AUTHOR]

The rockfish (Sebastes schlegeli) and striped beakperch (Oplegnathus fasciatus) were released in marine ranching areas in Korea, Japan, and China to maintain fishery resources in coastal areas. To estimate the density and biomass of fishery resources, the target strength (TS) of target marine organisms is needed to scale integrated volume backscattering coefficients. In this study, the target strength–length (TS–L) relationship for live rockfish and striped beakperch was derived using ex situ methods at a frequency of 200 kHz. The TS-L function for rockfish and striped beakperch can be expressed as TSAvg. = 20logTL − 69.25 (R2 = 0.35) and TSAvg. = 20logFL − 67.01 (R2 = 0.31), respectively. These results can be used to assess the growth, density, and abundance of the two species using acoustics. [ABSTRACT FROM AUTHOR]

This review draws on a long history of ichthyological and fisheries research to examine the changing stock status of the estuary-dependent white steenbras Lithognathus lithognathus in the South African Swartkops and Knysna estuaries. The available evidence points to a major decline in the L. lithognathus population of the Swartkops Estuary, from an already exploited status in the late 1800s and early 1900s to a collapsed status by the late 1900s, and the loss of adults which were recorded as prevalent in the estuary in 1915. In recent decades, the spotted grunter Pomadasys commersonnii appears to have occupied the niche previously used by L. lithognathus in the Swartkops Estuary, although climate change may also be playing a role in this trend. The Knysna Estuary had a healthy juvenile L. lithognathus population in the 1970s and 1980s, but increasing anthropogenic pressures on the system, including exploitation by recreational anglers and small-scale fishers, are cause for concern, particularly as fishery regulations for this species are not being adhered to in this and other systems. No-take marine protected areas (MPAs) appear to have been successful in providing some opportunity for stock recovery by adult populations of L. lithognathus in certain coastal regions within the distributional range. In conjunction with adequate enforcement of current fishery regulations, the proclamation of estuarine protected areas (EPAs) for juveniles in important estuarine nursery areas is required to enable the stock to recover and for the status of this fishery resource to be upgraded from collapsed to sustainable in the future. By providing protection for L. lithognathus in selected no-take EPAs, these same areas could also benefit other overexploited marine fish species, such as the dusky kob Argyrosomus japonicus and leervis Lichia amia. [ABSTRACT FROM AUTHOR]

Aim: Surf zones are crucial nursery habitats for the early life stages of fish species associated with typical coastal ecosystems. However, little is known about the temporal patterns and drivers of fish assemblages in tropical surf zones. This study aimed to assess the (1) main changes in fish community structure throughout 1 year, (2) seasonal dynamic patterns in fish assemblages, and (3) key factors influencing fish assemblages in the tropical surf zones. Location: Gaolong Bay, Wenchang City, Hainan Island, China. Methods: Fish sampling was conducted monthly from June 2021 to May 2022 using a beach seine net. Fish species were identified using both morphological and molecular analyses. Kruskal–Wallis test, analysis of similarity, non‐metric multidimensional scaling analysis, and similarity percentage analysis were used to investigate the temporal fish assemblage patterns. Generalised additive models and canonical correspondence analysis were used to assess how environmental variables influence fish assemblages. Results: We identified 83 fish species, which were grouped into three ecotypes based on their primary habitat: coral reef‐seagrass‐associated species (CS) (35), mangrove‐estuarine‐associated species (ME) (30), and common coastal‐estuarine‐associated species (CE) (18). Most captured individuals were juveniles, and fish abundance and diversity were highest in May. Most CS species were abundant between March and May. ME and most CE species were dominant from June to August, and Mugilidae (CE) was abundant between October and February. Furthermore, surf fish assemblages were substantially influenced by tidal level, water temperature, conductivity, pH, turbidity, and dissolved oxygen. Conclusions: Juvenile fish were abundant in May and fish species with three ecotypes alternate in the surf zones throughout the year. Counter to much current thinking, March maybe the spawn peak of most fish species in the studied area, and we suggest that the fishing ban period could start from March instead of May in the inshore areas of Hainan Island. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Dalian Ocean University is the property of Journal of Dalian Ocean University Editorial Office 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.)

In recent years, significant changes in environmental conditions and marine ecosystems have been observed in the East Sea/Japan Sea. This study investigates the long‐term environmental dynamics and phytoplankton responses in the Ulleung Basin, situated in the southwestern East Sea/Japan Sea, utilizing satellite and in situ data from 2002 to 2021. Over this period, there was a noticeable increase in sea surface temperature (SST) (r = 0.5739, p < 0.01), accompanied by decreasing mixed layer depth (MLD) and chlorophyll‐a (Chl‐a) concentration (r = −0.6193 and −0.6721, respectively; p < 0.01). Nutrient concentrations within the upper 50 m significantly declined for nitrate and phosphate. A reduction in the N:P ratio indicated a shift from phosphorus‐limited to nitrogen‐limited environment. Moreover, primary production (PP) demonstrated a decreasing trend (r = −0.5840, p < 0.01), coinciding with an increase in small phytoplankton contribution (r = 0.6399, p < 0.01). Rising SST potentially altered the water column's vertical structure, hindering nutrient entrainment from the deep ocean. Consequently, this nutrient limitation may increase small phytoplankton contribution, resulting in a decline in total PP. Under the IPCC's SSP5‐8.5 scenario, small phytoplankton contribution in the Ulleung Basin is projected to rise by over 10%, resulting in a 29% average PP decrease by 2100. This suggests a diminishing energy supply to the food web in a warming ocean, impacting higher trophic levels and major fishery resources. These findings emphasize the critical need for understanding and monitoring these environmental shifts for effective fisheries management and marine ecosystem conservation. Plain Language Summary: In recent years, the East Sea/Japan Sea has experienced significant changes in its environment. This study focuses on the Ulleung Basin in the southwestern part of this region, utilizing satellite and in situ data from 2002 to 2021. We found that the sea surface temperature (SST) increased noticeably, whereas the mixed layer depth (MLD) and the chlorophyll‐a (Chl‐a) concentration decreased. Nutrient levels, specifically nitrate and phosphate, also significantly declined in the upper 50 m of the water. This shift indicates a change from a phosphorus‐limited to nitrogen‐limited environment. Additionally, the study noted a decline in primary production (PP), coupled with an increase in small phytoplankton contribution. The rising SST seems to have affected the vertical structure of the water column, making it harder for nutrients from the deep ocean to reach the surface. This nutrient limitation could be the reason for the increase in small phytoplankton and the overall decline in primary production. Looking ahead to 2100, under a specific climate change scenario, the study predicts a substantial increase in small phytoplankton contribution, leading to a significant decrease in total PP in the Ulleung Basin. This could impact the marine food web, affecting higher trophic levels and major fisheries. Key Points: Long‐term variability of primary production is closely related to sea surface warming in the Ulleung BasinPhytoplankton community structure in the Ulleung Basin can be altered due to sea surface warming and a nutrient regime shiftFuture predictions indicate an increase in the small phytoplankton contribution based on the warming scenario in the Ulleung Basin [ABSTRACT FROM AUTHOR]

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department 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.)

The unutilized and unproductive lands in alkaline and waterlogged areas can be used for income and employment generation through fisheries activities. Apart from the income generation, the reclamation of the land is also possible if the scientific practices are followed. Karnataka is bestowed with vast variety of water resources for fisheries activities, saline, alkaline and waterlogged areas are also present is large extent in the state where the land is unused in majority of the affected areas. In this study, Krishna command area was selected for demonstration of composite fish culture using alkaline and waterlogged lands. Four beneficiaries were identified and empowered on using of these affected areas for fish culture. They were provided with quality carp seed and 2 tons of supplementary feed to each and scientific fish culture practices were demonstrated. Meanwhile, the water quality, fish survival, health and growth were monitored throughout the demonstration period. The pH of the water gradually decreased from 8.9 to 7.5, majorly due to addition of organic load to the pond. Other water quality parameters were scientifically monitored and they exhibited a decreasing trend with optimal limits favoring to fish culture. Catla, sliver carp, grass carp, common carp and amur carp showed a better growth rate with others being in moderate condition. The total mean fish production was found to be 3.8 t/acre from the demonstration sites and with the mean gross revenue of 4.25 lakhs. [ABSTRACT FROM AUTHOR]

The measured fishing regulation is a fisheries management regulation that maximizes the utilization of fishery resources without disrupting their sustainability which is regulated through Government Regulation Number 11 of 2023 concerning Measured Fishing (Measured Fishing Regulation) and Regulation of the Minister of Marine and Fisheries Affairs Number 28 of 2023 concerning the Implementing of Government Regulation Number 11 of 2023 (Implementing Regulation of Measured Fishing). Measured fishing in Indonesia is carried out based on a catch quota system which aims to improve the welfare of fishermen. The urgency of this study is to determine the results of the economic analysis and the economic impact of Measured Fishing Regulation and Implementing Regulation of Measured Fishing because this policy will affect the livelihoods of fishermen whose numbers are very high in Indonesia. The aim of this study is to analyze and evaluate the regulation of measured fishing in Indonesia using the Economic Analysis of Law approach and theory. There are two things studied in this study, namely First, the regulation of catch quota based measured fishing in Indonesia. Second, Economic Analysis of Law on catch quota based Measuring Fishing Regulations in Indonesia. This study uses an empirical research method by making law the object of research by considering related data. The results of the study show that fishing in Indonesia is based on a catch quota system given to each fishing vessel. The catch quota given is transferable both between fishing vessels in the same and different Fisheries Business Permit. Referring to the theory taught by Richard A. Posner, it can be said that the quota-based Measuring Fishing Regulations in Indonesia regulated through PP No. 11 of 2023 do not meet the elements of value, utility and efficiency.

Understanding how ecosystem change influences fishery resources through trophic pathways is a key tenet of ecosystem‐based fishery management. System models (SM), which use numerical modeling to describe physical and biological processes, can advance inclusion of ecosystem and prey information in fisheries management; however, incorporating SMs in management requires evaluation against empirical data. The Bering Ecosystem Study Nutrient‐Phytoplankton‐Zooplankton (BESTNPZ) model is an SM (originally created by the Bering Ecosystem Study, which initiated in 2006 and was expanded by Kearney et al.) includes zooplankton biomass hindcasts for the Bering Sea. In the Bering Sea, zooplankton are an important prey item for fishery species, yet the zooplankton component of this SM has not been validated against empirical data. We compared empirical zooplankton data to BESTNPZ hindcast estimates for three zooplankton functional groups and found that the two sources of information are on different absolute scales. We found high correlation between relative seasonal biomass trends estimated by BESTNPZ and empirical data for large off‐shelf copepods (Neocalanus spp.) and low correlations for large on‐shelf copepods and small copepods (Calanus spp. and Pseudocalanus spp., respectively). To address these discrepancies, we constructed hybrid species distribution models (H‐SDM), which predict zooplankton biomass using the BESTNPZ hindcast and environmental covariates. We found that H‐SDMs offered marginal improvements over correlative species distribution models (C‐SDMs) relying solely on empirical data for spatial extrapolation and little improvement for most functional groups when forecasting short‐term temporal zooplankton biomass trends. Overall, we suggest that interpretation of current BESTNPZ hindcasts should be tempered by our understanding of key mismatches in absolute scale, seasonality, and annual indices between BESTNPZ and empirical data. [ABSTRACT FROM AUTHOR]

Japanese anchovy Engraulis japonicus of the Tsushima Current stock migrate to the northwestern Japan Sea in warm season and play there an important role in the pelagic food web. According to survey and fishery data, the commercial stock of this species declines recently that determines decreasing of intensity of its migrations into the Russian waters, though its level is still appropriate for fishery. The anchovy releases ashore occur sometimes on the Far-Eastern coast, likely in cases of unstable environments that have become more frequent under climate change. More intense research of the pelagic ecosystem in the northwestern Japan Sea is necessary to clarify the status of fishery resources formed by southern migrants, including anchovy, sardine and mackerel.