Khatun Mst Halima, Zahangir Md Mahiuddin, Akhter Bably, Parvej Mohammed Rashed, Liu Qun
College of Fisheries, Ocean University of China, Qingdao, 266003 Shandong, PR China.
Department of Fish Biology and Biotechnology, Chattogram Veterinary and Animal Sciences University, Chattagram- 4225, Bangladesh.
Heliyon. 2023 Feb 21;9(3):e13818. doi: 10.1016/j.heliyon.2023.e13818. eCollection 2023 Mar.
Sustainable fisheries management depends on the degree of the present exploitation status of significant fish stocks. A recently developed fish stock assessment approach, CMSY, was used to estimate the fisheries reference points of data-limited and from the Kaptai reservoir using catch data, resilience, and exploitation records during the first and last year of the time series catch data. CMSY, along with a Bayesian state-space Schaefer production model (BSM), estimated maximum sustainable yield (MSY) as 2680 mt and 2810 mt, and 3280 mt and 3020 mt for the above stocks, respectively. The MSY range for both stocks was higher than the last catches meaning that both stocks are perfectly sustainable. The lower biomass B (4340 mt) for estimated by CMSY and (4490 mt) indicates that the stock has started to be depleted. However, considering the precautionary fisheries management, the lower limit of MSY might be suggested to follow. Therefore, it could be suggested not to exceed the MSY limit (2680 mt) for the sustainability of stock while it was 3020 mt for the fishery. The intrinsic growth rate was 0.862-1.19 yr for and 0.428-0.566 yr for suggesting a high and medium increase of biomass in the existing population, respectively. A less than 1 and greater than 1 report both stocks at underfishing and underfished states. The study recommends enforcing strict and lawful actions regarding the net's mesh size to catch less small fish. Otherwise, negligence of this crucial management practice may bring severe threats to the sustainability of the whole reservoir resources and the reservoir ecosystem.
可持续渔业管理取决于重要鱼类种群当前的开发利用程度。一种最近开发的鱼类种群评估方法——CMSY，被用于利用时间序列渔获数据的第一年和最后一年的渔获数据、恢复力及开发利用记录，来估计数据有限的卡普泰水库的渔业参考点。CMSY与贝叶斯状态空间Schaefer生产模型（BSM）一起，分别估计上述种群的最大可持续产量（MSY）为2680公吨和2810公吨，以及3280公吨和3020公吨。两种种群的MSY范围均高于最近的渔获量，这意味着两种种群都具有完全的可持续性。CMSY估计的较低生物量B（4340公吨）和（4490公吨）表明该种群已开始枯竭。然而，考虑到预防性渔业管理，可能建议遵循MSY的下限。因此，为了种群的可持续性，可能建议不超过MSY限制（2680公吨），而对于渔业来说，该限制为3020公吨。种群的内在增长率分别为0.862 - 1.19年，渔业的内在增长率为0.428 - 0.566年，这分别表明现有种群生物量有高增长和中等增长。小于1和大于1表明两种种群分别处于捕捞不足和捕捞过度状态。该研究建议对网眼尺寸实施严格合法的措施，以减少小鱼的捕捞量。否则，忽视这一关键管理措施可能会给整个水库资源和水库生态系统的可持续性带来严重威胁。
