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This study discussed the sense of belonging, position, livelihood sustainability, and vulnerabilities of the fishery-dependent nomadic community in Bangladesh. Due to technological advancements, infrastructural developments, and progress in medical science, the ancient traditions and culture of this nomadic community are on the verge of extinction. Fishing is identified as the most sustainable livelihood approach for the nomadic community compared to other professions, with an average daily income of up to BDT 700 ± 100 during the fishing season. However, this community faces numerous natural and anthropogenic threats that affect their traditional occupations and livelihoods, making their lives more vulnerable. Natural drivers include climatic catastrophes, storms, winds, cyclones, and tides. Anthropogenic drivers include fishing bans, dependency on a single profession (fishing), lack of effective alternative income-generating options, and social, economic, and cultural exclusion. The government and responsible NGOs should take a holistic approach to design livelihood interventions for nomadic fishers. [ABSTRACT FROM AUTHOR]

The present study aimed to develop a suitable method for the production of good quality shidol at the Floodplain Substation, Bangladesh Fisheries Research Institute (BFRI), Santahar, Bogura, Bangladesh. For this purpose, an improved quality shidol was prepared following scientific methods by BFRI, while traditional shidol was collected from Rangpur, Kurigram, Dinajpur, Lalmonirhat, Bogura, Nilphamary, Syedpur region. In the present study, proximate composition, biochemical and microbiological analysis of the BFRI made shidol and the traditional shidol were carried out during the 90 days of storage period after vacuum packaging. In proximate composition analysis, higher level of protein and fat content were found in BFRI made shidol than the traditional shidol. However, the traditional shidol samples showed poor quality due to the high total volatile base nitrogen (TVB-N), peroxide values, and moisture along with a promising microbial load; in contrast, the results obtained in the BFRI shidol samples were within the acceptable limit for human consumption. The presence of coliform bacteria in the traditional shidol also reflected the improper handling, unawareness of good hygiene and sanitation during production. The results of this study indicate that vacuum packaging can be an effective method in maintaining the quality of shidol by preventing crosscontamination and delaying the degradation of nutrients. Additionally, an improved BFRI technology for shidol production can minimize the biochemical and microbiological quality loss of shidol. [ABSTRACT FROM AUTHOR]

The present study was conducted by Bangladesh Fisheries Research Institute, Floodplain Substation to investigate the reproductive biology of Ailia coila in the northern region of Bangladesh. A total number of 100 fish samples were collected on a monthly basis from the Atrai River and Jamuna River during the period from January 2022 to December 2022. The highest mean value of the gonado-somatic index (GSI) was recorded in July (8.78 ± 1.95%), whereas the lowest was found in December (0.15 ± 0.09%). The highest individual fecundity (2,450 ± 570) and ova diameter (0.38 ± 0.07 mm) was also observed in July. From the histological observation of the ovary, the highest percentages (75%) of mature oocytes were observed during the month of July. Based on the GSI, fecundity and gonadal histology, the breeding season of A. coila was observed from June to August with a remarkable peak in July. In the case of length weight relationship (LWR), the coefficient of determination value (r2) was found 0.96 and the slope was found b = 1.50 which indicated the pattern of negative allometric growth of this species as b < 3. In contrast, an increase was recorded in the fecundity associated with the rise of total length, body weight and gonad weight showed a significant linear relationship. This study would assist in the development of induced breeding techniques and provide valuable information for the sustainable management of this population in the inland open ecosystem. [ABSTRACT FROM AUTHOR]

This experiment was conducted for the development of induced breeding techniques of Neotropius atherinoides using pituitary gland (PG) extract at the Floodplain Substation, BFRI, Santahar, Bogura, Bangladesh. Three breeding trials were conducted during the months of April, May, and June where fifteen pairs of males and females were used for each trial. During the first trial in April, PG extract was used at a rate of 25, 30, and 35mg PG/kg body weight of the female fish; however, no fish individual was ovulated. Then, two more breeding trials were conducted in May and June using 12 mg (T1), 13 mg (T2), and 14 mg (T3) PG/kg body weight of female and 6 mg (T1), 7 mg (T2), and 8 mg (T3) PG/kg body weight of male fish. During this time, the ovulation rates were recorded as 63.12±1.21, 65.21±2.13, and 69.14±1.59% in May and 65.23±1.62, 68.59±1.80, and 71.87±1.91% in June under T1, T2 and T3 treatments, respectively. Fertilization rates of eggs were estimated as 59.24±1.12, 61.36±1.31, and 62.34±1.21% in May and 62.85±1.30, 64.74±1.51, and 66.39±1.40% in June, respectively. Hatching rates of eggs were recorded as 75.54±2.11, 79.64±1.62, and 80.33±1.10% in May and 80.89±1.30, 82.48±1.12, and 86.98±1.90% in June under T1, T2 and T3 treatments, respectively. Significantly (P<0.05) higher values of the mean gonado-somatic index were observed during June, July, and August for females, and July showed the highest value. The female and male showed the best breeding performance in June treated with the dose of 14mg and 8mg PG/kg body weight, respectively. Results from the present experiment revealed that induced breeding of N. atherinoides, using PG extract is successful which might be helpful in mass seed production of this species for aquaculture as well as conserving the species in nature. [ABSTRACT FROM AUTHOR]