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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Pulse trawling: Evaluating its impact on prey detection by small-spotted catshark (Scyliorhinus canicula)
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Pulse trawling: Evaluating its impact on prey detection by small-spotted catshark (Scyliorhinus canicula)

机译：脉冲拖网捕捞：评估其对小斑点猫鲨（Scyliorhinus canicula）对猎物检测的影响

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摘要

Pulse fishing may pose a promising alternative for diminishing the ecosystem effects of beam trawling. However, concerns about the impact on both target and non-target species still remain, amongst others the possible damage to the electro-receptor organs, the Ampullae of Lorenzini, of elasmobranchs. The current study aimed to examine the role of pulsed direct current (PDC) used in pulse trawls on the electro-detection ability of the small spotted catshark, Scyliorhinus canicula. The electroresponse of the sharks to an artificially created prey-simulating electrical field was tested before and after exposure to the pulsed electrical field used to catch flatfish and shrimp. No statistically significant differences were noted between control and exposed animals, both in terms of the number of sharks exhibiting an electroresponse prior to and following exposure as well as regarding the timing between onset of searching behaviour and biting at the prey simulating dipole. These results indicate that, under the laboratory circumstances as adopted in this study, the small-spotted catshark are still able to detect the bioelectrical field of a prey following exposure to PDC used in pulse trawls. However, to fully grasp the impact of PDC on elasmobranchs, further studies are imperative, including examining the effect on reproduction and young life stages, the longer-term and indirect influences and experiments under field conditions. (C) 2016 Elsevier B.V. All rights reserved.
机译：脉冲捕捞可能是减少束拖网对生态系统影响的一种有前途的选择。然而，仍然担心对目标物种和非目标物种的影响，尤其是对弹性支的电感受器官洛伦兹尼壶腹的损害。当前的研究旨在检查脉冲拖网中使用的脉冲直流电（PDC）对斑点小猫鲨Scyliorhinus canicula的电检测能力的作用。在暴露于用于捕捞比目鱼和虾的脉冲电场之前和之后，测试了鲨鱼对人工创建的模拟猎物电场的电响应。对照动物和暴露动物之间在统计学上均未发现显着差异，无论是在暴露之前和之后表现出电响应的鲨鱼数量，还是在搜索行为开始和模仿猎物偶极咬食之间的时间。这些结果表明，在本研究中采用的实验室环境下，小斑猫鲨仍然能够在暴露于脉冲拖网中使用的PDC之后检测猎物的生物电场。但是，要完全掌握PDC对弹性分支的影响，必须进行进一步的研究，包括研究对生殖和幼年阶段的影响，长期和间接影响以及田间条件下的实验。 （C）2016 Elsevier B.V.保留所有权利。

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