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首页> 外文期刊>Latin american journal of aquatic research >The effects of subsampling and between-haul variation on the size-selectivity estimation of Chilean hake (Merluccius gayi gayi)
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The effects of subsampling and between-haul variation on the size-selectivity estimation of Chilean hake (Merluccius gayi gayi)

机译：二次采样和距离之间的变化对智利鳕鱼（Merluccius gayi gayi）的大小选择性估计的影响

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Using the data collected in a size selectivity experiment on Chilean hake (Merluccius gayi gayi) carried out in 2000, the selectivity parameters for four codend mesh sizes (100, 110, 130, and 140 mm of mesh size opening) were estimated and modelled by the SELECT model. These analyses included considerations of the sampling proportions of the catch in the codend and cover. Furthermore, the analyses took into account between-haul variation. The l50 values were 30.8, 29.9, 30.0, and 41.2 cm of total length, respectively, values lower than the estimates obtained from previous studies. The contribution of explanatory variables to the selectivity model was also tested in order to determine the role of mesh size, catch size (in number), and towing speed. Increases in catch size and in towing speed were accompanied by decreases in the l50 estimates. These results demonstrate how incorporation of subsampling effect and explanatory variables to model between-haul variation can improve selectivity estimates and management of a valuable resource.
机译：使用在2000年进行的智利鳕鱼大小选择性实验中收集的数据，估算了四种编码网眼尺寸（孔径为100、110、130和140毫米）的选择性参数，并通过以下方法建模SELECT模型。这些分析包括考虑在编码区和覆盖区中渔获物的采样比例。此外，分析考虑了运输之间的差异。 150的总长度分别为30.8、29.9、30.0和41.2厘米，低于先前研究得出的估计值。还测试了解释变量对选择性模型的贡献，以确定筛孔尺寸，捕获尺寸（数量）和拖曳速度的作用。捕捞量和拖曳速度的增加伴随着150估计值的减少。这些结果表明，将二次采样效果和解释变量结合起来以模拟运输之间的变化如何可以提高选择性估计和宝贵资源的管理。

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