Manipulation of farmed Atlantic salmon swimming behaviour through the adjustment of lighting and feeding regimes as a tool for salmon lice control
Manipulation of farmed Atlantic salmon swimming behaviour through the adjustment of lighting and feeding regimes as a tool for salmon lice control
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DOI：
10.1016/j.aquaculture.2013.12.012
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发表时间：
2014-03-20
期刊：
影响因子：
4.5
通讯作者：
Migaud, H.
中科院分区：
文献类型：
--
作者：
Frenzl, B.;Stien, L. H.;Migaud, H.
本文介绍了一项环境调控鲑鱼游泳深度的研究，旨在减少鲑鱼寄生虫对大西洋鲑鱼的养殖场感染。在假定商业鲑鱼种群中鲑鱼感染减少的假设下，测试了水下人工照明(位于10m深处)和水下投喂(在5m深处投放)对鲑鱼游泳深度和海虱感染的影响。这是基于两个假设，第一，浮游的沙门氏菌幼虫主要停留在表层水域(顶部4米)，第二，深光和摄食吸引鲑鱼到更深的水深处。商业规模试验的结果证实，在浸没的饲养条件下，鲑鱼的游动行为发生了变化，在饲养过程中，鱼类被吸引到摄食走廊。当鱼达到饱和或停止摄食时，它们会在白天回到表层水域。夜里，水下的灯光将鱼吸引到了灯光照亮的水深处。白天，自然光在一定程度上盖过了这些影响。在夏季的几个月里，暴露在深水照明下的鱼身上的沙门氏菌数量明显低于露天照明网箱中鲑鱼身上发现的虱子数量。就这些试验中发现的沙门氏菌数量而言，潜水饲养没有显示出比水面饲养更多的优势。研究结果表明，可以在商业规模上使用游泳深度操纵来减少大西洋鲑鱼种群的鲑鱼虱子负担。(C)爱思唯尔出版的2014年。
This paper describes a study in which environmental manipulation of salmon swimming depth was tested in an attempt to reduce farm infection of Atlantic salmon, Salmo scalar by the salmon louse, Lepeophtheirus sulmonis. The effects of submerged artificial lighting (positioned at 10 m depth) in combination with submerged feeding (delivered at 5 m depth) were tested with respect to salmon swimming depth and sea lice infection, following the hypothesis that L. salmonis infection in a commercial salmon population is reduced when exposed to deep lighting and feeding. This is based on two assumptions, firstly that planktonic L. sulmonis larvae principally remain in surface waters (top 4 m) and secondly, that deep lighting and feeding attract salmon to deeper water depths. Results from commercial scale trials confirmed that salmon swimming behaviour is altered under submerged feeding conditions with fish attracted to the feeding corridor during the feeding process. When the fish reached satiation or feeding ceased, they returned to the surface waters during the day. Submerged lighting attracted the fish to the illuminated water depths during the night. During the day, natural light overruled these effects to some extent. The number of L. salmonis on fish exposed to deep submerged lighting was significantly lower than the number of lice found on salmon in cages with surface lighting during the summer months. Submerged feeding showed no advantage over surface feeding with respect to the number of L. salmonis found in these trials. The results of the study suggest that swimming depth manipulation can be used at a commercial scale to reduce salmon lice burdens on Atlantic salmon stocks. (C) 2014 Published by Elsevier B.V.