Cost of transport and optimal swimming speed in farmed and wild European silver eels (Anguilla anguilla)
Cost of transport and optimal swimming speed in farmed and wild European silver eels (Anguilla anguilla)
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DOI：
10.1016/j.cbpa.2008.05.011
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发表时间：
2008-09-01
影响因子：
2.3
通讯作者：
van den Thillart, Guido
中科院分区：
文献类型：
--
作者：
Palstra, Arjan;van Ginneken, Vincent;van den Thillart, Guido
每秒0.4米(ms(-1))的游泳速度是欧洲雌性银鳗及时到达马尾藻海产卵地的最低速度。由于银鳗在开始海洋洄游时停止进食，因此应最大限度地降低运输成本（COT）并优化游泳速度，以获得最高的能量效率。在这项研究中，我们研究了银鳗的最佳游泳速度（U-opt），因为U-opt可能高于最小游泳速度，并且更可能类似于实际的巡航速度。进行了各种游泳测试，以比较养殖鳗鱼和野生鳗鱼在淡水和海水中的耐力游泳。游泳测试使用 101 条雌性银鳗（60-96 厘米，400-1500 克）在 18 摄氏度的气候房间内的 22 个 Blazka 型游泳隧道中进行，并有流动的淡水或海水。测试以 0.5-1.0 m s(-1) 进行，增量为 0.1 m s-1，间隔为 2 小时或 12 小时。值得注意的是，两项测试均表明耗氧量（(M) 相对于 dotO(2)））和 COT 没有随时间变化。不同组的U-opr值范围在0.61和0.68 m s(-1) (0.74-1.02 BL s(-1))之间，因此比最小速度高53-70%。在U-opt，COT 为37-50 Mg O-2 kg(-1) km(-1)。这些相对非常低的值证实了我们之前的观察。海水中的COT值比淡水中高约20%。假设迁徙的雌性银鳗在它们的U-opt处巡航，它们将能够在3-4个月内走完到达马尾藻海的距离，为最终成熟和寻找配偶留下充足的时间。 (C) 2008 Elsevier Inc. 保留所有权利。
A swimming speed of 0.4 meters per second (m s(-1)) is the minimal speed for European female silver eels to reach the spawning sites in the Sargasso Sea in time. As silver eels cease feeding when they start their oceanic migration, the cost of transport (COT) should be minimised and the swimming speed optimised to attain the highest energetic efficiency. In this study, we have investigated the optimal swimming speed (U-opt) of silver eels since U-opt may be higher than the minimal swimming speed and is more likely to resemble the actual Cruise speed. A variety of swimming tests were performed to compare endurance swimming between farmed eels and wild eels, both in freshwater and in seawater. The swimming tests were run with 101 silver female eels (60-96 cm, 400-1500 g) in 22 Blazka-type swim tunnels in a climatised room at 18 degrees C with running freshwater or seawater. Tests were run at 0.5-1.0 m s(-1) with increments of 0.1 m s-1, and either 2 h or 12 h intervals. Remarkably, both tests revealed no changes in oxygen consumption ((M) over dotO(2))) and COT over time. U-opr values ranged between 0.61 and 0.68 m s(-1) (0.74-1.02 BL s(-1)) for the different groups and were thus 53-70% higher than the minimal speed. At U-opt, the COT was 37-50 Mg O-2 kg(-1) km(-1). These relatively very low values confirm our earlier observations. COT values in seawater were about 20% higher than in freshwater. Assuming that migrating female silver eels cruise at their U-opt, they will be able to cover the distance to the Sargasso Sea in 3-4 months, leaving ample time for final maturation and finding mates. (C) 2008 Elsevier Inc. All rights reserved.