Abstract

Although fishing with electricity is illegal in the European Union, a number of temporary licences allowed converting beam trawlers to pulse trawling. To analyse how the adaption of pulse trawling changed this fishery, we studied fishing speeds and landings per unit effort as proxies for catch efficiencies for the main target species. Compared to conventional tickler chain beam trawls, pulse trawls were towed at lower speeds (small vessels −10%, large vessels −23%). Large vessels that switched from conventional beam trawls to pulse trawls at the end of 2009 gradually increased catch efficiency for sole over the period of almost 1 year. While pulse trawling was found to have higher catch rates (kg/h) for sole (small vessels +74%, large vessels +17%), lower catch rates were observed for plaice (small vessels −31%, large vessels −32%). Vessels that switched later achieved immediate gains in catch efficiency for sole. The change in catch efficiency is likely due to the difference in cramp response between the species.

中文翻译：

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由于用电刺激替代了机械刺激，导致对比目鱼的海底拖网捕捞效率发生变化

摘要

尽管在欧洲联盟用电捕鱼是非法的，但许多临时许可证允许将拖网拖网渔船转换为脉冲拖网渔船。为了分析脉冲拖网捕捞的适应方式如何改变这种渔业，我们研究了捕捞速度和每单位工作量的着陆量，以此作为主要目标物种捕捞效率的代表。与传统的滴答链式拖链拖网相比，脉冲拖网以较低的速度拖曳（小船只-10％，大船只-23％）。在2009年底从常规束拖网转换为脉冲拖网的大型船舶，在近1年的时间内逐渐提高了唯一的捕获效率。尽管发现脉冲拖网的鞋底捕获率（kg / h）较高（小型容器+ 74％，大型容器+ 17％），的捕获率较低（小型容器-31％，大型容器-32％ ）。后来更换的船只立即获得了唯一的抓地效率。捕捞效率的变化可能是由于物种之间的抽筋反应不同所致。