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首页> 外文期刊>ICES Journal of Marine Science >A general catch comparison method for multi-gear trials: application to a quad-rig trawling fishery for Nephrops
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A general catch comparison method for multi-gear trials: application to a quad-rig trawling fishery for Nephrops

机译：用于多齿轮试验的通用捕捞比较方法：应用于四头龙虾拖网捕捞渔业

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摘要

Expeditious uptake of quad-rig trawling in the economically important Irish fishery for Nephrops norvegicus outpaced technical understanding of this newly introduced gear. The main driver for its introduction is increased catch rates of Nephrops. Higher Nephrops discard rates associated with quad-rig trawling are likely to be problematic under the landing obligation unless size selectivity can be improved. Catch comparison methods are suitable for assessing the performance of fishing gear modifications to reduce discards. Utilizing a quadrig potentially increases the number of gears that can be included in a catch comparison study to four but current modeling methods are limited to two gears. Our study provides a new general multinomial mixed effects modeling framework that can be applied to two or more gears, elucidates how case-specific and choice-specific covariates may influence catch at length, and facilitates discussion on appropriate gear based management measures. Application of the method to catches from four different cod-end mesh sizes revealed significant effects of carapace length, catch weight and net position, on the numbers of Nephrops retained in each cod-end. Results suggest that management measures which specifically address different catch profiles associated with different numbers of trawling rigs are required to optimize Nephrops size selectivity.
机译：对于具有经济意义的爱尔兰海螯虾（Nephrops norvegicus）而言，在爱尔兰具有重要经济意义的渔业中对四轮拖网渔具的迅速采用超过了对这种新引进渔具的技术理解。引入它的主要驱动力是增加了海肾的捕获率。除非可以提高尺寸选择性，否则在着陆义务下，与四联拖网渔船相关的较高的海肾丢弃率可能会成问题。渔获量比较方法适用于评估改进渔具以减少丢弃物的性能。使用四轮驱动可能将渔获量比较研究中可以包含的齿轮数量增加到四个，但是当前的建模方法仅限于两个齿轮。我们的研究提供了一种新的通用多项混合效果建模框架，该框架可应用于两个或多个齿轮，阐明了案例特定变量和选择特定协变量如何影响长捕获，并促进了有关基于齿轮的适当管理措施的讨论。该方法对来自四种不同鳕鱼尾网眼尺寸的渔获物的应用表明，甲壳长度，捕捞重量和净位置对保留在每个鳕鱼尾部的海螯虾数量有显着影响。结果表明，需要采取管理措施来专门解决与不同数量的拖网渔船有关的不同渔获情况，以优化海螯虾的大小选择性。

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