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首页> 外文期刊>Fisheries Research >Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body
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Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body

机译：南极磷虾（Euphausia Superba）在商业编码和拖网身上的大小选择

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摘要

During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic organisms passively drifting with currents, but they also display self-locomotion by active swimming. There is a lack of knowledge regarding the behavior of krill during the fishing process, and extrapolating results obtained for other species to krill is of limited value. In the case of krill, it is largely unknown to what extent the codend versus the trawl body contributes to the size selection process. The current study aims to quantify the size selection of krill in a commercially applied codend during experimental fishing. Combining these results with a model for full trawl size selectivity it was possible to provide an insight to the size selection process in the trawl body. Specifically, the study applied a two-step approach by first estimating the size selectivity of a commercial codend and second used the codend size selectivity obtained in this study to estimate the trawl body size selectivity of a commercial trawl based on entire trawl-selectivity obtained in a previous study. The results of this two-step analysis revealed that the trawl body contributes significantly to the total size selection process, demonstrating that size selectivity of Antarctic krill in commercial trawls is affected by both the trawl body and the codend.
机译：在钓鱼期间，许多鱼类可以避免拖网体的网壁，因此大部分尺寸选择发生在网的编码中。南极磷虾（Euphausia Superba）被认为是真正的浮游生物被动地用电流漂移，但它们也通过主动游泳展示自动运动。缺乏有关磷虾行为的知识，在捕鱼过程中，为其他物种到磷虾的外推结果是有限的。在KRILL的情况下，它在很大程度上未知在拖网对倾斜的程度上有助于尺寸选择过程。目前的研究旨在在实验捕捞期间量化在商业施用的编码中的KRILL尺寸选择。将这些结果与全拖网尺寸选择性的型号相结合，可以在拖网体中提供对尺寸选择过程的洞察。具体地，研究通过首先估计商业编码的尺寸选择性和第二使用本研究中获得的编码尺寸选择性来应用两步方法，以估计基于所获得的整个轨道选择性的商业轨道的拖网体尺寸选择性。以前的研究。该两步分析的结果显示，拖网体对总尺寸选择过程有贡献显着贡献，证明南极克尔在商业拖网中的尺寸选择性受到拖网和编码的影响。

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