The low impact of fish traps on the seabed makes it an eco-friendly fishing technique
The low impact of fish traps on the seabed makes it an eco-friendly fishing technique
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DOI：
10.1371/journal.pone.0237819
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发表时间：
2020-08
期刊：
影响因子：
3.7
通讯作者：
D. Kopp;Yann Coupeau;B. Vincent;F. Morandeau;Sonia Méhault;J. Simon
中科院分区：
文献类型：
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作者：
D. Kopp;Yann Coupeau;B. Vincent;F. Morandeau;Sonia Méhault;J. Simon
除了了解捕捞对收获的鱼类种群的影响外，还需要考虑对非目标物种、栖息地和海底完整性的影响。静态渔具经常被认为是一种比拖曳渔具影响更小的捕鱼方式，尽管研究它们对海底的实际影响的研究很少。在这项研究中，我们旨在描述与浸泡时间和陷阱回收有关的海底渔网运动。比较了轻型矩形圈闭和较重型圆形圈闭对海底的影响。我们使用3D摄像机来估计浸泡期间海底的扫掠运动和对沉积物的渗透。在回收过程中，每种捕集器扫过的面积和距离由面向海底的摄像机确定。利用声学多普勒电流剖面仪评估了诱捕器在干线周围的潜在旋转。结果表明，无论是轻型还是重型商业捕集器，即使在高潮汐系数（最大6 cm）的情况下，在浸泡时间内都没有检测到渗透，几乎没有检测到移动。当潮汐转向时，不能观察到旋转。与拖曳渔具和其他静态渔具相比，在回收过程中，陷阱覆盖的清扫面积较小（最大2.04平方米）。
Besides understanding the effects of fishing on harvested fish stocks, effects on non-target species, habitats and seafloor integrity also need to be considered. Static fishing gears have often been mentioned as a lower impact fishing alternative to towed gears, although studies examining their actual impact on the seafloor are scarce. In this study, we aimed to describe fish trap movements on the seafloor related to soaking time and trap retrieval. Impacts on the seafloor of lightweight rectangular traps and heavier circular traps were compared. We used 3D video cameras to estimate sweeping motion on the seabed and penetration into the sediment during soaking time. The area and distance swept by each type of trap during retrieval was determined by a camera set up facing the sea bottom. The potential rotation of the traps around the mainline was assessed using an Acoustic Doppler Current Profiler. Results showed that no penetration and almost no movements could be detected during soaking time for either lightweight or heavy commercial traps, even for high tidal coefficient (maximum 6 cm). No rotation could be observed when the tide turned. The swept area covered by a trap during retrieval was low (maximum 2.04 m2) compared to towed fishing gear and other static gear.