Brackley R, Lucas M C, Thomas R, Adams C E, Bean C W
Scottish Centre for Ecology & the Natural Environment, IBAHCM, University of Glasgow, Rowardennan, Glasgow, G63 0AW, U.K.
Department of Biosciences, University of Durham, South Road, Durham, DH1 3LE, U.K.
J Fish Biol. 2018 May;92(5):1635-1644. doi: 10.1111/jfb.13596. Epub 2018 Mar 14.
This study assessed the usefulness of passing euthanized Atlantic salmon Salmo salar smolts through an Archimedean screw turbine to test for external damage, as compared with live, actively swimming smolts. Scale loss was the only observed effect. Severe scale loss was 5·9 times more prevalent in euthanized turbine-passed fish (45%) than the live fish (7·6%). Additionally, distinctive patterns of scale loss, consistent with grinding between the turbine helices and housing trough, were observed in 35% of euthanized turbine-passed smolts. This distinctive pattern of scale loss was not seen in live turbine-passed smolts, nor in control groups (live and euthanized smolts released downstream of the turbine), which suggests that the altered behaviour of dead fish in turbine flows generates biased injury outcomes.
本研究评估了将安乐死的大西洋鲑（Salmo salar）幼鱼通过阿基米德螺旋涡轮机以检测外部损伤的有效性，并与活的、积极游动的幼鱼进行了比较。观察到的唯一影响是鳞片脱落。安乐死且通过涡轮机的鱼中严重鳞片脱落的发生率（45%）比活鱼（7.6%）高5.9倍。此外，在35%安乐死且通过涡轮机的幼鱼中观察到了与涡轮机螺旋和外壳槽之间摩擦一致的独特鳞片脱落模式。在活的通过涡轮机的幼鱼以及对照组（在涡轮机下游释放的活鱼和安乐死的幼鱼）中均未观察到这种独特的鳞片脱落模式，这表明涡轮机水流中死鱼行为的改变会产生有偏差的损伤结果。
