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首页> 外文期刊>ICES Journal of Marine Science >Salmon lice infestations on sea trout predicts infestations on migrating salmon post-smolts
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Salmon lice infestations on sea trout predicts infestations on migrating salmon post-smolts

机译：海鳟鲑鱼虱子侵染预示着鲑鱼蜕皮后迁移

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摘要

Impacts of sea lice (Lepeophtheirus salmonis or Caligus spp.) on wild salmonids is currently one of the most important issues facing management of fish farms in salmon producing countries in the northern hemisphere. Surveillance of sea lice on wild Atlantic salmon (Salmo salar) is often hampered by the ability to catch enough migrating post-smolts. Therefore, sea lice abundance on anadromous trout (Salmo trutta) is often used to infer sea lice abundance on migrating salmon post-smolt. However, the assumption that there is a relationship between the abundance of lice on salmon and trout has never been tested. Here we use a dataset of sea lice on salmon post-smolt and sea trout that have been caught simultaneously in trawl hauls, to evaluate the correlation in abundance of sea lice between the two species using various statistical models. We demonstrate that trout generally has higher abundances of sea lice than salmon. Average lice per gram fish on sea trout (log transformed) predicted the abundance of lice on salmon best. Negative binomial models of lice counts were preferable to using trout lice counts as direct estimates of salmon lice abundance, and they had better predictive ability than logit models of high (vs. low) lice counts. Including the size of the salmon increased the predictive ability of the model, but these data are not generally available. The effect of salmon weight may have been a direct effect of body size, or an indirect effect of time spent in marine waters. Finally, we predict lower salmon lice counts on migrating salmon with our selected binomial model than with the current method of using trout lice counts as a direct estimator on salmon lice counts, and demonstrate that management advice would change considerably depending on the chosen method.
机译：目前，海虱对野生鲑鱼的影响是管理北半球鲑鱼生产国养鱼场面临的最重要问题之一。捕获足够的迁徙后软体动物的能力常常阻碍了对野生大西洋鲑鱼（Salmo salar）上海虱的监视。因此，经常使用鲑鱼上的海虱丰度来推断鲑鱼在熏鲑后的迁移情况。但是，关于鲑鱼上大量虱子和鳟鱼之间存在联系的假设从未得到检验。在这里，我们使用拖网捕捞中同时捕获的鲑鱼后鲑和鳟鱼上的海虱数据集，以使用各种统计模型评估两个物种之间海虱丰度的相关性。我们证明，鳟鱼通常比鲑鱼有更多的海虱。海鳟鱼每克鱼的平均虱子（对数转换）最能预测鲑鱼上虱子的丰度。阴性的二项式虱子计数模型比使用鳟鱼虱子计数作为鲑鱼虱子丰度的直接估计值更可取，并且它们比高虱子计数（对低虱子计数）的logit模型具有更好的预测能力。包括鲑鱼的大小增加了模型的预测能力，但这些数据通常不可用。鲑鱼体重的影响可能是体重的直接影响，或者是海水中时间的间接影响。最后，我们用我们选择的二项式模型预测迁移的鲑鱼的鲑鱼虱子计数要比目前使用鳟鱼虱子计数作为鲑鱼虱子计数的直接估计数的方法低，并证明根据所选择的方法，管理建议将有很大变化。

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