Abstract

Square mesh panels (SMPs) are selective devices used extensively to supplement codend size selectivity in trawl fisheries. Therefore, predictions of the effect of mesh size in both SMPs and codends on size selectivity are valuable. Here, we established a framework to predict the size selection of blue whiting through different SMPs and diamond mesh codends based on the morphological characteristics of this species. We hypothesized that size selection for an SMP is determined by different fish contact angles, whereas different mesh opening angles determine size selection for the codend. Based on these hypotheses, we first developed a model that enabled us to predict which sizes of blue whiting are able to pass through meshes of different sizes and shapes. We then tested whether the selectivity for blue whiting of the SMP, the codend, and the combination of both could be explained by the models. Finally, we predicted the size selectivity of multiple combinations of SMPs and diamond mesh codends. The method presented here can potentially be applied to make predictions for species other than blue whiting.

中文翻译：

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基于鱼类形态的方格板预测和蓝鳕鱼的共生体尺寸选择性

摘要

方形网状面板（SMP）是广泛用于补充拖网渔场中鱼种尺寸选择性的选择性装置。因此，预测SMP和码元中的网格尺寸对尺寸选择性的影响是有价值的。在这里，我们建立了一个框架，根据该物种的形态特征，通过不同的SMP和钻石网眼来预测蓝鲸的大小选择。我们假设SMP的尺寸选择是由不同的鱼接触角决定的，而不同的网孔张开角度则决定了编码对象的尺寸选择。基于这些假设，我们首先开发了一个模型，该模型使我们能够预测哪些尺寸的蓝鲸能够穿过不同尺寸和形状的网格。然后，我们测试了SMP，编码对象，模型可以解释两者的结合。最后，我们预测了SMP和菱形网状码元的多种组合的尺寸选择性。这里介绍的方法可以潜在地用于预测除蓝鳕以外的物种。