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首页> 外文期刊>ICES Journal of Marine Science >Surface selection of haddock and cod in the Norwegian demersal seine fisheries
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Surface selection of haddock and cod in the Norwegian demersal seine fisheries

机译：挪威人塞纳河渔业的海拔地区的表面选择

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摘要

Size selection in active fishing gears is a continuous process and undersized fish may escape during the whole fishing operation. Fish that escape during the surface hauling operation are likely to experience higher mortality due to barotrauma-related stress than fish escaping at the fishing depth during the towing process. A well-functioning selectivity device should therefore select mostly at depth for enhancing survival probabilities of escaping fish. The current gear regulation in the Norwegian demersal seine fishery is likely to cause large proportion of undersized fish to escape at the surface. In this study, we estimated surface selection of haddock and cod in demersal seine by using an automatic release system and a small meshed codend that collected fish escaping during surface hauling. The collecting bag contained 19% undersized haddock compared to 10% in the conventional square-mesh codend indicating that about 50% of undersized haddock brought to the surface were released. The proportions of undersized cod were 8% for the collecting bag and 1% for the conventional square-mesh codend. These results demonstrate that surface selection is significant for both haddock and cod. Based on this finding, we discuss methods to improve size selectivity at the fishing depth.
机译：主动渔具中的尺寸选择是一个连续的过程，并且在整个钓鱼操作期间可能会逸出。在表面牵引过程中逃逸的鱼可能会因巴罗拉姆与牵引过程中捕捞深度逃逸的鱼类而导致的死亡率更高。因此，良好的功能选择性设备应主要选择深度以增强逃逸鱼的存活概率。挪威塞纳莱渔业的当前齿轮调节可能导致大部分的虚线鱼在表面逸出。在这项研究中，我们通过使用自动释放系统和小型网状编码，估计在塞纳河中塞纳中的鳕鱼和鳕鱼的表面选择，以及在表面牵引过程中逸出的鱼逸出。收集袋含有19％的尺寸下尺寸的大鼠，而传统的平方网格编码中的10％表示，表明释放到表面的约50％的下尺寸的毛刺。用于收集袋的低尺的比例为8％，对于传统的平方网格编码，1％。这些结果表明，表面选择对于鳕鱼和鳕鱼都是显着的。基于这一发现，我们讨论了提高捕鱼深度尺寸选择性的方法。

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