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首页> 外文期刊>Journal of fisheries and aquatic science >Assessment of Species Specificity of Fishing Gears and Fish Diversity Status in the Andharmanik River of Coastal Bangladesh
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Assessment of Species Specificity of Fishing Gears and Fish Diversity Status in the Andharmanik River of Coastal Bangladesh

机译：孟加拉国沿海安达曼尼河的渔具种类特异性和鱼类多样性状况评估

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Background and Objective: In Southern Bangladesh, the Andharmanik river is an ichthyofaunal resourceful coastal water body due to adjacent to the Bay of Bengal. An investigation has been undertaken to identify available fishing gears and their specificity on the fishes as well as the fish diversity status of the river for a period of one year from November, 2014 to October, 2015. Methodology: The PRA tools were employed for data collection. Results: The survey revealed total 17 different types of fishing gears under 8 major groups of net. A total of 48 fish species under 10 orders and 26 families were identified by using these gears. Mesh size of the gears were varied from 0.508-15.24 cm depending on targeted fish species and some of them were very selective to specific species. Fish diversity was assessed by using Shannon-Weiner index (H), evenness (E), Simpson's dominance index (D), Simpson's index of diversity (1-D) and Margalef's index (d) ranges between 3.33-3.42,0.67-0.73,0.042-0.048,0.952-0.958and 4.72-5.24, respectively for three stations of the river. The highest fish occurrence belongs to the Perciformes order (33.33%) and lowest five orders viz., Aulopiformes, Beloniformes, Osteoglossiformes, Pleuronectiformes and Tetraodontiformes were found as same (2.08%) among the total fish population. Conservation status disclosed that out of 48 species 3, 3 and 8 species belonged to endangered, critically endangered and vulnerable, respectively. Conclusion: The fishes of the river were under pressure by different non-selective, illegal and restricted fishing gears. So, scientific based management is prerequisite to guide the fish fauna from near extinction.
机译：背景与目的：在孟加拉国南部，安达曼尼米河（Andharmanik）由于毗邻孟加拉湾，是鱼类鱼类资源丰富的沿海水体。从2014年11月至2015年10月的一年时间里，我们进行了一项调查，以查明可用的渔具及其在鱼类上的特殊性以及河流的鱼类多样性状况。方法：采用PRA工具收集数据采集。结果：调查显示，在8个主要网类下共有17种不同类型的渔具。使用这些设备，共确定了10个目下的26个科目中的48种鱼类。渔具的网眼尺寸在0.508-15.24厘米之间变化，具体取决于目标鱼种，其中一些鱼对特定鱼种非常有选择性。通过使用Shannon-Weiner指数（H），均匀度（E），Simpson优势指数（D），Simpson多样性指数（1-D）和Margalef指数（d）对鱼类多样性进行评估，范围介于3.33-3.42,0.67-0.73之间三个河流站分别为0.042-0.048、0.952-0.958和4.72-5.24。在总鱼类种群中，鱼类的最高发生率属于鲈形目（33.33％），而最低的五个顺序为金龟形，贝洛尼形，骨形目，盾形目和四齿形目（2.08％）。保护状态表明，在48个物种中，有3、3和8种分别属于濒危，极度濒危和脆弱。结论：河流中的鱼类受到各种非选择性，非法和受限渔具的压力。因此，科学管理是引导鱼类濒临灭绝的前提。

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