Assessing stocks of (Hamilton, 1822) from three different management systems in (Oxbow lake) of southwest Bangladesh: Implications for sustainable management.

This study was conducted to observe the stock assessments of in three different management systems of (Oxbow lake) such as System-1, System-2, and System-3. In this study, 1806 specimens were sampled using traditional fishing nets to observe growth pattern, population structure, growth parameters, natural mortality (), fishing mortality (), total mortality (), recruitment pattern, exploitation rate (), relative yield per-recruit (), optimum catchable length, length at first capture, steady state biomass (), and maximum sustainable yield () from January to December 2021. Digital slide calipers and a digital balance were used to measure each individual's total length () and body weight (), respectively. An empirical maximum length-based model was used to calculate size at first sexual maturity (), and optimum catchable length () was calculated based on asymptotic length (). The least square linear regression equation was used to determine the regression parameters. The value of regression parameter, '' was 3.01 for system-1, 2.78 for system-2, and 2.70 for system-3, indicating that growth pattern of is isometric in system-1, but negative allometric growth in system-2 and system-3. The highest asymptotic length () and weight () of were found in system-1 (11.19 cm and 13.67 g) in comparison with system-2, (10.98 cm and 12.49 g) and system-3 (9.09 cm and 6.96 g) respectively. The growth coefficient () of the von Bertalanffy growth function (VBGF) was 0.72 year, 0.72 year, and 0.73 year for system-1, system-2 and system-3, respectively. The calculated were 1.72, 1.28, and 3.00 year for system-1, 1.11, 0.67 and 1.78 year for system-2 and 1.12, 0.84 and 1.96 year for system-3 respectively. The calculated life span () was found 4.19 years for system-1, 4.15 years for system-2 and 4.12 years for system-3. The recruitment patterns showed that the highest relative percentage of recruits were found in July, June and September for system-1, system-2 and system-3 respectively, with the major recruitment peak occurring from April to June for system-1, May to June for system-2 and June to July for system-3. One minor recruitment peak also occurred from August to September in system-1. The exploitation rate was more or less same in all three systems indicating that is under exploited from all the . The significantly highest and were found in system-1 (22.65 and 12.11 metric tons), compared to system-2 (16.16 and 10.28 metric tons) and system-3 (5.55 and 5.49 metric tons), respectively. Considering the values of regression parameters, recruitment pattern, and , system-1 was found more suitable for compared to system-2 and system-3 management practices of . Finally, these findings will turn out to be paradigm for the impregnable management of in of southwest Bangladesh.