Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Dr., Ottawa, ON K1S 5B6, Canada. Electronic address: https://twitter.com/AmandaJeanson.
Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Dr., Ottawa, ON K1S 5B6, Canada.
Comp Biochem Physiol A Mol Integr Physiol. 2023 Oct;284:111469. doi: 10.1016/j.cbpa.2023.111469. Epub 2023 Jul 17.
The biological consequences of catch-and-release angling have been studied for decades, yet little is known about the compounding effects of repeated recreational fisheries recaptures on the physiology and behaviour of angled fish. Using heart rate biologgers and behavioural assays, this study investigated the physiological and behavioural consequences of multiple simulated angling events (i.e., repeated stressors) on female steelhead (Oncorhynchus mykiss), under current (6 °C) and future (11 °C) water temperature scenarios. While steelhead in the warmer water temperature scenario demonstrated alterations in cardiac function (e.g., increases in maximum heart rate and scope of heart rate) and evidence of behavioural impairments (e.g., decreases in chase activity and landing time) over the course of two simulated angling events, cold water treated fish had negligible change. Fish subjected to two simulated angling events under warm water temperature conditions tended to demonstrate an increase in recovery time and scope for heart rate, and a decrease in resting heart rate. A second experiment was conducted to test for sex-specific differences in the heart rate response of steelhead subjected to an increase in water temperature. Females demonstrated a higher scope for heart rate when compared to males during the event and during recovery. More work is needed to better understand the interaction between multiple angling events and recovery from these events at various water temperatures, and the biological basis for sex-specific differences in cardiac function and response to challenges. This study contributes to a growing body of evidence on the effects of repeated stressors on wild fish.
数十年来，人们一直在研究捕放式钓鱼对鱼类的生物学影响，但对于重复休闲渔业捕捞对垂钓鱼类的生理和行为的累积影响却知之甚少。本研究使用心率生物记录器和行为分析，调查了在当前（6°C）和未来（11°C）水温情景下，多次模拟钓鱼事件（即重复压力源）对雌性虹鳟（Oncorhynchus mykiss）的生理和行为后果。在温暖水温情景下，虹鳟的心脏功能发生了改变（例如，最大心率和心率范围增加），并出现了行为障碍的证据（例如，追逐活动和着陆时间减少），而在较冷水温下处理的鱼类几乎没有变化。在温暖水温条件下，经过两次模拟钓鱼事件后，鱼类的恢复时间和心率范围增加，静息心率降低。第二个实验测试了水温升高对虹鳟心率反应的性别特异性差异。与雄性相比，雌性在事件发生时和恢复期间的心率范围更高。需要做更多的工作来更好地了解在不同水温下多次钓鱼事件及其恢复过程之间的相互作用，以及在心脏功能和对挑战的反应方面存在性别特异性差异的生物学基础。本研究为重复压力源对野生鱼类的影响的不断增加的证据做出了贡献。
