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首页> 外文期刊>ICES Journal of Marine Science >The estimation of hidden seal-inflicted losses in the Baltic Sea set-trap salmon fisheries
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The estimation of hidden seal-inflicted losses in the Baltic Sea set-trap salmon fisheries

机译：波罗的海捕捞鲑鱼捕捞中海豹造成的隐性损失的估计

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摘要

A database has been constructed using detailed information on catches and seal-disturbance from contracted commercial fishers in the northern Baltic Sea. A model was developed for the calculation of seal-induced losses in set traps for salmon. The model compared catches on consecutive days or day-pairs. It was found that the total losses in set traps were high: 61% of the potential catch in a trend-adjusted sample of paired data. A significant part of these losses, such as fish wholly removed from gear was hidden. The traditional method of assessing losses by counting the remains of fish underestimated losses by 46%. The scaring effect of seal visits was not included. The model was also used for an analysis of the damage process. There were significant negative after-effects of seal visits on catch levels. It was also found that seal visits co-occur with salmon runs. It seems that seals prefer smaller to larger salmon when raiding traps. It is suggested that the traditional method of estimating losses by counting fish remains should be calibrated when used and that the new model with day-pairs should be tried in analyses of seal interference in other fishing operations.
机译：利用关于波罗的海北部合约商业渔民的渔获量和海豹干扰的详细信息，建立了一个数据库。开发了一个模型来计算鲑鱼诱捕器中海豹引起的损失。该模型比较了连续几天或成对的渔获量。发现在设定陷阱中的总损失很高：在经过趋势调整的配对数据样本中，潜在陷阱的61％。这些损失的很大一部分，例如完全从渔具上移走的鱼，被隐藏起来。通过计算鱼的残留量来评估损失的传统方法将损失低估了46％。不包括海豹探访的惊吓作用。该模型还用于损坏过程的分析。海豹探访对渔获量水平有显着的负面影响。还发现海豹访问与鲑鱼奔跑同时发生。突袭陷阱时，海豹似乎更喜欢大鲑鱼。建议在使用时，应校准传统的通过计算鱼类残留量估算损失的方法，并应尝试使用日对新模型来分析其他捕捞作业中的海豹干扰。

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