Abstract The use of lumpfish in salmon farming allows the removal of sea lice all year round, without the use of chemicals or mechanical treatments. In Norway alone, around 31 million lumpfish are currently put into sea pens whereas no efficient method to re-catch these fish once they no longer are efficient salmon lice grazers (from 300 g) exists. At present, collecting lumpfish in sea-cages is a labour- and time-consuming process and, if these fish are to be harvested, an efficient method for collecting lumpfish is urgently needed. In this study, we tested coloured light as an attractant to lure lumpfish into passive traps (pods). Three small-scale pilot experiments both demonstrated the highest re-capture rate when a blue light-source was used, whereas red and yellow light gave the lowest re-capture rate. A subsequent large-scale trial failed to demonstrate significant re-catch of lumpfish. It is concluded that although blue light clearly attracted lumpfish in laboratory trials, further studies are needed in order to exploit this attribute commercially.

中文翻译：

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如果可以，请抓住我：如何使用光作为引诱剂重新捕获鲽鱼

摘要 在鲑鱼养殖中使用鲳鱼可以全年去除海虱，无需使用化学品或机械处理。仅在挪威，目前约有 3,100 万条鲱鱼被放入海洋围栏中，而一旦这些鱼不再是高效的鲑鱼虱食草动物（从 300 克起），就没有有效的方法重新捕获它们。目前，在海笼中收集鲽鱼是一个费时费力的过程，如果要捕捞这些鱼，迫切需要一种有效的收集鲽鱼的方法。在这项研究中，我们测试了有色光作为一种引诱剂，将鲽鱼引诱到被动陷阱（豆荚）中。三个小规模的试点实验都表明，当使用蓝色光源时，再捕获率最高，而红光和黄光的再捕获率最低。随后的一项大规模试验未能证明有大量的鲽鱼被重新捕获。得出的结论是，尽管在实验室试验中蓝光明显吸引了肿块鱼，但需要进一步研究以在商业上利用这一特性。