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Thermal selection and delayed migration by adult sockeye salmon (Oncorhynchus nerka) following escape from simulated in-river fisheries capture
Fisheries Research ( IF 2.2 ) Pub Date : 2022-04-12 , DOI: 10.1016/j.fishres.2022.106321
Laura K. Elmer 1, 2 , David L. Moulton 2 , Andrea J. Reid 1, 2 , Anthony P. Farrell 3 , David A. Patterson 4 , Brian Hendriks 2 , Steven J. Cooke 1 , Scott G. Hinch 2
Affiliation  

Two hypotheses were tested concerning the consequences to adult sockeye salmon (Oncorhynchus nerka) of escape from commonly used fishing gear (gillnet, seine net and tangle net). First, by experimentally exposing 214 fish to three commonly used fishing gear types (gillnets, tangle nets, or seine nets) and releasing to complete migration after PIT-tagging, we tested the hypothesis that migration success and behaviour are differentially impacted according to the type of fishing gear interaction and escape. Also, by fitting salmon with thermal loggers, we tested whether salmon behaviourally selected cooler lake water following an escape encounter. Migration success was unaffected after escape from the simulated gear types compared to control fish. Surviving sockeye salmon that had gillnet or seine net encounter, but not a tangle net encounter, on average took approximately 2 days longer to migrate to the spawning area (averaging 14.7 days and 14.9 days, respectively) compared to control fish (12.6 days). Furthermore, escaped fish migrated at cooler temperatures through a lake system (average of 14.0 °C) compared to control fish (15.3 °C), which would reduce their absolute cost of transport during this migration by reducing the standard metabolic rate by about 10%. Consequently, in addition to demonstrating that fish escapement from a fishing gear will alter their subsequent migration behaviour, we introduce the possibility that the associated increase in energy expenditure and migration delay can be partially compensated for by behavioural selection of cooler water, if it is available, to lower basic energy turnover in a fish that is entirely reliant on energy stores to fuel its spawning migration.



中文翻译:

成年红鲑(Oncorhynchus nerka)逃离模拟河内渔业捕获后的热选择和延迟迁移

对成年红鲑(Oncorhynchus nerka) 逃离常用渔具(刺网、围网和缠结网)。首先,通过实验将 214 条鱼暴露于三种常用渔具类型(刺网、缠结网或围网)并在 PIT 标记后释放以完成洄游,我们检验了洄游成功和行为受到不同类型影响的假设。渔具互动和逃生。此外,通过为鲑鱼配备热记录仪,我们测试了鲑鱼在逃生后是否会选择较冷的湖水。与对照鱼相比,从模拟的渔具类型逃脱后迁移成功不受影响。遇到刺网或围网但没有遇到缠网的幸存红鲑鱼迁移到产卵区平均需要大约 2 天(平均 14.7 天和 14.7 天)。分别为 9 天)与对照鱼(12.6 天)相比。此外,与对照鱼(15.3°C)相比,逃逸的鱼在较冷的温度下通过湖泊系统(平均14.0°C)洄游,这将通过将标准代谢率降低约10%来降低它们在此洄游过程中的绝对运输成本。 . 因此,除了证明鱼从渔具中逃脱会改变它们随后的洄游行为外,我们还介绍了一种可能性,即如果可以的话,可以通过选择较冷的水来部分补偿能量消耗和洄游延迟的相关增加。 ,以降低完全依赖能量储存来为其产卵迁移提供燃料的鱼的基本能量周转率。与对照鱼(15.3°C)相比,逃逸的鱼在较冷的温度下通过湖泊系统(平均14.0°C)迁移,这将通过将标准代谢率降低约10%来降低迁移过程中的绝对运输成本。因此,除了证明鱼从渔具中逃脱会改变它们随后的洄游行为外,我们还介绍了一种可能性,即如果可以的话,可以通过选择较冷的水来部分补偿能量消耗和洄游延迟的相关增加。 ,以降低完全依赖能量储存来为其产卵迁移提供燃料的鱼的基本能量周转率。与对照鱼(15.3°C)相比,逃逸的鱼在较冷的温度下通过湖泊系统(平均14.0°C)迁移,这将通过将标准代谢率降低约10%来降低迁移过程中的绝对运输成本。因此,除了证明鱼从渔具中逃脱会改变它们随后的洄游行为外,我们还介绍了一种可能性,即如果可以的话,可以通过选择较冷的水来部分补偿能量消耗和洄游延迟的相关增加。 ,以降低完全依赖能量储存来为其产卵迁移提供燃料的鱼的基本能量周转率。这将通过将标准代谢率降低约 10% 来降低它们在迁移过程中的绝对运输成本。因此,除了证明鱼从渔具中逃脱会改变它们随后的洄游行为外,我们还介绍了一种可能性,即如果可以的话,可以通过选择较冷的水来部分补偿能量消耗和洄游延迟的相关增加。 ,以降低完全依赖能量储存来为其产卵迁移提供燃料的鱼的基本能量周转率。这将通过将标准代谢率降低约 10% 来降低它们在迁移过程中的绝对运输成本。因此,除了证明鱼从渔具中逃脱会改变它们随后的洄游行为外,我们还介绍了一种可能性,即如果可以的话,可以通过选择较冷的水来部分补偿能量消耗和洄游延迟的相关增加。 ,以降低完全依赖能量储存来为其产卵迁移提供燃料的鱼的基本能量周转率。

更新日期:2022-04-12
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