方形网孔编带提高了印度西北海岸底拖网中垂头鞭虫的尺寸选择性和捕获模式

Q1 Agricultural and Biological Sciences
Madhu Vettiyattil , Bent Herrmann , Meenakumari Bharathiamma
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引用次数: 0

摘要

本研究主要研究了在40mm菱形网和方形网中垂头鞭虫的尺寸选择性和捕获模式。使用了34米高的开放式拖网,这是印度西北海岸渔民使用的常见设计,并采用覆盖-编解码器方法来确定编解码器的选择性。随着方网和菱形网的使用,在50%保留率下,勒氏锥虫的长度发生了变化,根据个体总数和捕获物的总重量,评估了了解该物种在渔业中的开发模式的指标。当使用40mm正方形网格码代替菱形网格时,平均选择长度增加,丢弃率降低,然而,观察到商业长度的个体也会损失。研究结果表明,鉴于该物种第一次性成熟时的估计长度为61.2厘米,仅强制使用法定网目尺寸不足以帮助该物种的可持续收获。这是第一项比较该物种在印度西北海岸40毫米菱形和方形网目编码区的尺寸选择的研究。研究结果将有助于作为该地区基于齿轮的法规的基线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Square mesh codend improves size selectivity and catch pattern for Trichiurus lepturus in bottom trawl used along Northwest coast of India

The size selectivity and catch pattern of Trichiurus lepturus in 40 mm diamond and square mesh codends were investigated in this study. A 34 m high opening trawl was used, which is a common design used by fishermen operating along the northwest coast of India, and the cover codend method was employed to determine codend selectivity. Along with the changes in the length at 50% retention rate for Trichiurus lepturus with the usage of the square and diamond mesh codends, indicators to understand the exploitation pattern of this species in the fishery were assessed based on the total number of individuals and on total weight of the catch. The mean selection length increased and discard fraction is reduced when 40 mm square mesh codends are used in place of diamond meshes, however, it is observed that individuals at commercial length are also lost. The results demonstrate that mandatory use of legal mesh sizes alone will be insufficient to aid in the sustainable harvest of this species, given its estimated length at first sexual maturity of 61.2 cm. This is the first study to compare the size selection of this species in 40 mm diamond and square mesh codends along Northwest coast of India. Results of the study will help as a baseline for gear-based regulations in the region.

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来源期刊
Aquaculture and Fisheries
Aquaculture and Fisheries Agricultural and Biological Sciences-Aquatic Science
CiteScore
7.50
自引率
0.00%
发文量
54
审稿时长
48 days
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