Forrester Ruaidhri, Honkanen Hannele M, Lilly Jessie, Green Amy, Rodger Jessica R, Shields Brian A, Ramsden Philip, Koene J Peter, Fletcher Melanie, Bean Colin W, Adams Colin E
Scottish Centre for Ecology and the Natural Environment, School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, UK.
Atlantic Salmon Trust, Perth, UK.
J Fish Biol. 2025 Feb;106(2):376-388. doi: 10.1111/jfb.15928. Epub 2024 Oct 12.
Trap and transport, the capture and subsequent translocation of fish during the freshwater phase of their migration, is becoming more common as a management intervention. Although the technique can be successful, it is costly and can have unintended effects on the fish being transported. This study investigates whether trap and transport can be used to increase the migration success of Atlantic salmon, Salmo salar, smolts in naturally flowing rivers. Seaward-migrating S. salar (n = 294) from two UK rivers were tracked using acoustic telemetric techniques. Outmigration success and timing were compared between non-transported (released at the original in-river capture site) and transported (released ca. 23 km downstream of the capture site) individuals. Downstream translocation increased the proportion of fish that successfully migrated to marine waters, and there was no indication that transport reduced post-release survival. The post-release migration speed of transported fish was slower than expected but this was likely a function of their advanced migration timing rather than an inhibition of their capacity to migrate. These results suggest that trap and transport can increase the outmigration success of S. salar smolts, but the earlier river exit dates of transported fish could negatively affect their survival at sea.
诱捕与运输，即在鱼类洄游淡水阶段对其进行捕获并随后转移，作为一种管理干预措施正变得越来越普遍。尽管该技术可能会成功，但成本高昂，且可能对被运输的鱼类产生意想不到的影响。本研究调查了诱捕与运输是否可用于提高大西洋鲑（Salmo salar）幼鱼在自然流动河流中的洄游成功率。使用声学遥测技术追踪了来自英国两条河流的向海洄游的大西洋鲑（n = 294）。比较了未运输（在原河流捕获地点放流）和运输（在捕获地点下游约23公里处放流）个体的洄游成功率和时间。向下游转移增加了成功洄游到海水区域的鱼类比例，并且没有迹象表明运输会降低放流后的存活率。运输后鱼类放流后的洄游速度比预期慢，但这可能是它们提前洄游时间的结果，而不是对其洄游能力的抑制。这些结果表明，诱捕与运输可以提高大西洋鲑幼鱼的洄游成功率，但运输后鱼类提前离开河流的日期可能会对它们在海洋中的生存产生负面影响。
