Previous results show that juvenile shortnose sturgeon are steady swimmers and, compared with salmonids, generally have low critical swimming (UCrit) and endurance swimming capacities. Most studies on swimming capacities of sturgeon, and other fishes, include those where fish have only been swum once and metrics of swimming performance are assessed (e.g., time swum, speed achieved). Under natural conditions, there are ample instances where fish would undergo multiple swimming cycles when traversing fish ways, culverts and other sources of fast water flow. While some evidence exists for salmonids, the effects of repeat swimming are not well known for sturgeon. The current study consisted of two experiments. The first examined the critical swimming (UCrit) of juvenile shortnose sturgeon following 3 consecutive swimming trials with a 30 minute recovery period between subsequent tests. The second examined the endurance swimming capacities of juvenile shortnose sturgeon following 3 consecutive swimming trials with a 60 minute recovery period between subsequent tests. Our findings indicate that: (i) UCrit was consistent (~2 Body lengths/s) among swimming trials; (ii) significant individual variation exists between individuals in the endurance swimming trials; and (iii) consistent results exist for individuals across swimming trials in both the UCrit and the endurance swimming tests. These results suggest that juvenile shortnose sturgeon have a high recovery capacity, and their behaviour and morphology likely reflect aspects of their swimming capacities. This article is protected by copyright. All rights reserved.

中文翻译：

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在幼年短鼻鲟 (Acipenser brevirostrum) 中重复 UCrit 和耐力游泳

先前的结果表明，幼年短鼻鲟是稳定的游泳者，与鲑鱼相比，通常具有较低的临界游泳 (UCrit) 和耐力游泳能力。大多数关于鲟鱼和其他鱼类游泳能力的研究，包括那些只游过一次鱼并评估游泳性能指标（例如，游泳时间、达到的速度）的研究。在自然条件下，在很多情况下，鱼类在穿越鱼道、涵洞和其他快速水流源时会经历多次游泳循环。虽然存在一些关于鲑鱼的证据，但对鲟鱼重复游泳的影响并不为人所知。目前的研究包括两个实验。第一次检查了短鼻鲟幼鱼在连续 3 次游泳试验后的临界游泳 (UCrit)，随后的测试之间有 30 分钟的恢复期。第二个检查了短鼻鲟幼鱼在连续 3 次游泳试验后的耐力游泳能力，随后的测试之间有 60 分钟的恢复期。我们的研究结果表明：（i）UCrit 在游泳试验中是一致的（~2 体长/秒）；(ii) 在耐力游泳试验中，个体之间存在显着的个体差异；(iii) 在 UCrit 和耐力游泳测试中，个体在游泳试验中存在一致的结果。这些结果表明幼年短鼻鲟具有很高的恢复能力，它们的行为和形态可能反映了它们游泳能力的各个方面。本文受版权保护。版权所有。