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Potential for codends with shortened lastridge ropes to replace mandated selection devices in demersal trawl fisheries
Canadian Journal of Fisheries and Aquatic Sciences ( IF 2.4 ) Pub Date : 2021-10-28 , DOI: 10.1139/cjfas-2021-0178
Manu Sistiaga 1 , Jesse Brinkhof 2 , Bent Herrmann 3 , Roger B. Larsen 4, 5 , Eduardo Grimaldo 6, 7 , Kristine Cerbule 8 , Ilmar Brinkhof 9 , Terje Jørgensen 10
Affiliation  

Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
In many trawl fisheries, codend size selectivity is supplemented by adding selection devices to the gear. In the Barents Sea gadoid fishery, combining diamond mesh codends with sorting grids is compulsory. However, the use of grids increases the costs and complexity of the gear, causing discontent among fishermen and prompting researchers to seek alternative solutions. Lastridge ropes are ropes attached to the selvedges of the codend. In this study, we tested the effect of shortening the lastridge ropes of two diamond mesh codends with different mesh sizes on the size selectivity of cod (Gadus morhua), haddock (Melanogramus aeglefinnus), and redfish (Sebastes spp.). Shortening the lastridge ropes by 15% increased the mesh opening during the fishing process, which significantly improved the size-selective properties of the codends. Further, the L50 values were always higher for the codends in the short lastridge configuration. Therefore, codends with shortened lastridge ropes may be a simpler alternative to sorting grids in this fishery, and they may be applicable to many other fisheries in which additional selection devices are used.


中文翻译:

具有缩短尾脊绳索的密码有可能取代底层拖网渔业中的强制选择设备

加拿大渔业和水生科学杂志,印刷前。
在许多拖网渔业中,通过在网具上添加选择装置来补充编码大小的选择性。在巴伦支海的 gadoid 渔业中,必须将菱形网格编码器与分类网格相结合。然而,网格的使用增加了渔具的成本和复杂性,引起了渔民的不满,并促使研究人员寻求替代解决方案。Lastridge 绳索是附在 codend 边缘的绳索。在这项研究中,我们测试了缩短两种不同网眼尺寸的菱形网眼密码对鳕鱼 (Gadus morhua)、黑线鳕 (Melanogramus aeglefinnus) 和红鱼 (Sebastes spp.) 的尺寸选择性的影响。将尾脊绳索缩短 15% 增加了捕鱼过程中的网孔开口,这显着提高了密码的尺寸选择性能。进一步,在短 lastridge 配置中,密码的 L50 值总是更高。因此,带有缩短尾脊绳索的密码可能是该渔业中分类网格的更简单替代方案,并且它们可能适用于使用额外选择设备的许多其他渔业。
更新日期:2021-10-28
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