刺网绳粗对马尔马拉湖鲤鱼捕捞效率和选择性的影响

H. Dereli̇, T. Kebapçıoğlu, Yusuf Şen, Zeki Serkan Ölçek, E. Dinçtürk, Aylin Ulman
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引用次数: 0

摘要

研究了多丝刺网缠绕厚度对鲤鱼捕捞选择性和捕捞效率的影响。2015年6月至2016年12月,在位于土耳其西部的马尔马拉湖,使用两种不同线粗(210d/2和210d/3)的多丝刺网在140、150、160、180和200 mm的网目尺寸上进行了采样。与薄材料(210d/2)相比,具有相同网目尺寸的厚多丝材料(210d/3)获得了更高的模态长度和更低的单位努力捕获量(CPUE)值以及更低的次最小着陆尺寸(MLS)个体率(不包括180和200 mm网目尺寸)。两种线厚的所有网格尺寸均提供高于MLS的模态长度。然而,细绳材料的小鱼的标称百分比较高(8%),当考虑所有网目尺寸时,总捕获量的可接受限度为5%。结果表明,随着缠绕材料的厚度增加,模态长度和扩散值增加,选择性和捕获效率降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of gillnet twine thickness on catching efficiency and selectivity for common carp (Cyprinus carpio Linnaeus, 1758) fishery in Marmara Lake
The effects of multifilament gillnet twine thickness on selectivity and catching efficiency for the common carp fishery were investigated in this study. Sampling was carried out with multifilament gillnets of two different twine thicknesses (with 210d/2 and 210d/3) on 140, 150, 160, 180, 200 mm mesh sizes between June 2015 and December 2016 in Marmara Lake, located in Western Turkey. Higher modal lengths and lower catch per unit effort (CPUE) values and lower sub-minimum landing size (MLS) individuals rate (excluding 180 and 200 mm mesh sizes) were obtained in the thick multifilament material (210d/3) with the same mesh size compared to thin material (210d/2). All mesh sizes in both twine thickness provided modal lengths above the MLS. However, the thin twine material had a higher nominal percentage of undersized fish (8%), greater than the 5% accepted limit for total catches when all mesh sizes are considered together. As a result, the modal lengths and spread values increased and the selectivity and catching efficiency decreased with the thicker twine material.
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