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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >Effects of unequal capture probability on stock assessment abundance and mortality estimates: an example using the US Atlantic sea scallop fishery
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Effects of unequal capture probability on stock assessment abundance and mortality estimates: an example using the US Atlantic sea scallop fishery

机译:不平等捕获概率对股票评估丰富和死亡率估计的影响:使用美国大西洋海扇贝渔业的例子

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摘要

Most stock assessment models assume that the probability of capture for all individuals of the same size or age in the stock area is equal. However, this assumption is rarely, if ever, satisfied. We used spatially referenced simulations, based on the US Atlantic sea scallop (i>Placopecten magellanicus/i>) fishery, to generate catch, survey index, fishing effort, and size structure data that we input into a (nonspatial) catch-at-size stock assessment model to estimate abundance and mortality rates. We show that spatial patterns in fishing mortality degrade model performance for sessile stocks. Fishing mortality tended to be overestimated and abundance underestimated because trends in fishing mortality were exaggerated and the model misestimated the numbers of larger individuals due to spatial fishing patterns. These results are particularly relevant to sedentary species such as scallops, but are applicable wherever strong spatial patterns exist in fishing mortality.
机译:大多数股票评估模型假设股票区区相同大小或年龄相同尺寸或年龄的捕获概率相等。 然而,如果有的话,这一假设很少,满意。 我们使用的是基于美国大西洋海扇贝(& i> Placopecten Magellanicus)的空间引用的模拟,以产生我们输入(非缺点)捕获的捕获,调查指标,捕鱼工作和尺寸结构数据 -AT-SIZE股票评估模型估算丰富和死亡率。 我们展示了钓鱼死亡率的空间模式降低了术式股票的模型性能。 捕捞死亡率往往被高估,低估丰富的丰富,因为捕捞死亡率的趋势被夸大,而模型因空间捕捞模式而判处较大个体的数量。 这些结果与扇贝如扇贝等久坐不动物种特别相关,而是适用于捕捞死亡率强的空间模式的任何地方。

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