The purpose of studying the consequence of COVID-19 on oxbow lake (Baor) fisher's community is to counteract the negative impacts on livelihoods with food security and figure out diversified resilience options for sustaining basic needs of life. Individual questionnaire interviews, oral history, focus group discussion, and telephonic interviews were among the methodological techniques used to gather primary data. The Baor fisher's community was impaired with income, food and feeding habit, health and marketing. The Baor fishers had to stop harvesting or reducing the amount of fish harvest because of gradual decreasing of consumer demand and prices of fish during the course of COVID-19 pandemic period. The transportation costs were raised up to 50%–80%, while the prices of fish decreased by 15%–30% prior to the onset of COVID-19 pandemic. The frequency of fish consumption was significantly come down to 37.5%. Many households substituted fish to farm reared hens, eggs, domestic hens and ducks, lentils, and vegetables during the period of lockdown across the country. Supply chains of fish and fish culture inputswere disrupted due to inadequacy of transportation facilities. Many school- and college-going students were dropped outduring the ongoing pandemic situation due to their financial problems (10%) and early marriage (7.5%). The secondary sources of income (labor of netting in other aquaculture farms) of Baor fisher's community were also impaired. The resilience options of this study will be helpful to minimize the sudden economic crises, ensure dynamic fish value chains and food security, protect individuals from ongoing health hazards, and promote sustainable food production systems followed by social cohesion and stabilityagainst the prevailing challenges owing to the pandemic and other natural calamities.

Studies on the age, growth and maturity of Tenualosa ilisha are plagued by a lack of essential information; addressing this data gap is the aim of the present study. Six diverse habitats of hilsa across Bangladesh were chosen as sites for sample collection. For age determinations, lunar rings in the otolith of hilsa were used. The length and weight of each fish were recorded prior to otolith extraction. Extracted otoliths were polished to enable the visualization and quantification of rings. Except for the Kali River and Gaglajur Haor, age of the fish correlated strongly with both their length and weight (r > 0.95; p < /em> < 0.05). Again, except for those from the Kali River and Gaglajur Haor, all of the samples exhibited positive allometric growth patterns (b > 3) with the fish from the Tetulia River being the most positive (b = 3.48). The growth of T. ilisha in the Bangladesh was described as Lt = 48.02 [1-exp{-1.01(t-0.046)}] and growth performance was 3.04. The estimated Lm for T. ilisha was 26.04 (~ 26.00) (95% CL= 19.87-33.84) cm TL based on the maximum length-based model and it was confirmed by gonad histology. These results would be effective for the sustainable management of hilsa fishery in Bangladesh and neighboring countries.

The Barred spiny eel Macrognathus pancalus (Hamilton, 1822), is a very popular and nutritious fish food in south Asia. Life history traits including LFD, growth types, conditions (KA, KF, KR), relative weight (WR), form factor (a3.0), sexual maturity (Lm), and natural mortality (MW) of Macrognathus pancalus were estimated from 484 specimens collected (January to December 2018) at Wetland ecosystem known as Gajner Beel, in northwestern Bangladesh through different types of local fishing gear. Biometric measurements (Lengths, Weight) were measured through digital slide calipers and electronic weight balance with 0.01 cm and 0.01 g precision. In our study total length ranged from 6.00-18.80 cm and body weight ranged from 0.53-27.56 g for M. pancalus. The growth pattern was indicated positive allometric based on the estimated b values for this species. Allometric condition factor (KA) was the best condition factor among other types of condition factors for the wellbeing of M. pancalus. The observed a3.0 was 0.0055,Lm was 11.16 cm TL, and MW was 0.79for M. pancalus Gajner Beel. Finally, we conclude that the finding of this research will be supportive of the sustainable conservation of M. pancalus in Bangladeshi and neighboring waters.

This study provides scientific investigation on the relative growth pattern based on multiple linear dimensions and also observed the meristic characteristics of Anabas testudineus from the Gajner Beel northwestern (NW) Bangladesh from July to December 2018. A total of 454 individuals were collected and lengths and weight were noted up to 0.01 cm and 0.01g precision using a measuring board and digital weight balance, respectively. Fin rays and lateral line scales were counted by using a magnifying glass. Total length (TL) was ranged 7.40–14.50 cm while body weight (BW) ranged 7.90–64.00 g. Relationships of length-weight (LWRs) were highly significant (p < /em> <0.001) with r2values ≥ 0.823. TL vs. BW was one of the best models among ten equations based on r2 value in LWR. In comparison, length-length relationships (LLRs) were extremely important (p < /em> <0.001) and most of the r2 values were greater than 0.844. In LLR, SL vs. TL and PoAnL was the fitted model according to r2 value among nine equations. Fin formula of A. testudineus was D. 26-28 (XVI-XVIII 1-2/7-10) P1. 13-15 (1-2/11-14) P2. 6 (I5) A. 18-21 (VIII-XI1 2/8-10) C. 15-17 (2/13-15).The results of this study will keep a vital contribution to stock assessment and sustainable management for A. testudineus in this wetland ecosystem and other worldwide water bodies.

The current study was on temporal variations of length, weight, and condition of Tenualosa ilisha (Hamilton, 1822) from the Meghna River, Southeastern Bangladesh for the period of July 2018 to June 2019. A total of 1433 individuals were collected from the Meghna River (Chandpur and Laxmipur region, SE Bangladesh). Bodyweight (BW) and total length (TL) were measured with 0.01 g and 0.01 cm accuracy for each specimen. The relative condition factor (KR) was calculated by the equation of Le Cren (1951): KR = W/(a×Lb) where W is the body weight (g) and L is the total length (cm) and a & b is the length-weight relationship parameters estimated with linear regression analyses. The value of KR ~ 1 indicates good health, >1 indicates over bodyweight with compare to length, whereas <1 indicates a relatively poor condition of fish. The TL ranged from 15.3-57.8 cm while the BW was 37.17–2250 g. The overall KR for T. ilisha was 0.65-1.66 in the Meghna River. The maximum KR was found in July while the minimum was in January. The KRwas strongly correlated with BW in the Meghna River. These findings will help to improve the sustainable management policy of hilsa fishery in the Meghna river ecosystem and other adjacent water bodies.