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首页> 外文期刊>ICES Journal of Marine Science >The vertical separation of fish in the aft end of a demersal trawl
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The vertical separation of fish in the aft end of a demersal trawl

机译：潜网拖尾末端的垂直分离鱼

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摘要

Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in the aft end of a trawl, with the aim of separating cod (Gadus morhua) from other species. A non-linear multinomial model with random effects was used to analyse the data and to compare the performance of the two frames. The vertical distribution of cod in the aft end of the trawl was close to uniform, whereas haddock (Melanogrammus aeglefinus), whiting (Merlcmgius merlangus), plaice (Pleuronectes platessa), and lemon sole (Microstomus kitt) showed more uneven distributions. The use of guiding bars in the separator frame significantly (p < 0.05) increased the catch of cod, plaice, and lemon sole in the upper compartment. The vertical separation of cod was density-dependent; high densities of fish resulted in a more uniform distribution of cod. The species separations found differ from those reported from the studies of species separation in the region of the trawl mouth.
机译：两个多隔室分离器框架用于研究拖网船尾尾部一些商业上重要的鱼类的垂直分离，目的是将鳕鱼（Gadus morhua）与其他物种分离。使用具有随机效应的非线性多项式模型来分析数据并比较两个帧的性能。拖网尾端鳕鱼的垂直分布接近均匀，而黑线鳕（Melanogrammus aeglefinus），白ting（Merlcmgius merlangus），（Pleuronectes platesa）和柠檬lemon（Microstomus kitt）则显示出更不均匀的分布。分离器框架中导向杆的使用显着（p <0.05）增加了上部隔室中鳕鱼，和柠檬的捕获量。鳕鱼的垂直分离取决于密度。鱼的高密度导致鳕鱼的分布更加均匀。发现的物种分离不同于拖网口区域物种分离研究报告的物种分离。

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