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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of on-deck holding conditions and air exposure on post-release behaviours of sharks revealed by a remote operated vehicle
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Effects of on-deck holding conditions and air exposure on post-release behaviours of sharks revealed by a remote operated vehicle

机译：甲板上保持条件和空气暴露对遥控车辆揭示的鲨鱼释放后行为的影响

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摘要

While post-release mortality estimates have been conducted on a range of shark species, the short-term sublethal effects of capture, handling and release are poorly known and have been mostly investigated in controlled conditions. In addition, the widely accepted notion that immediate post-release active swimming is an indicator of shark condition has never been tested. This study assessed the effects of deck exposure by analysing postrelease behaviour of two species of shark, the draughtboard (Cephaloscyllium laticeps) and the piked spurdog (Squalus megalops) in-situ using a remote-operated-vehicle and in a replicated experiment in controlled conditions. In total, 67 sharks were caught with demersal fish trawls and commercial longlines and subjected to different deck exposures and release environments. Tailbeat rates of deck-exposed sharks were significantly lower than the control sharks, but this effect differed between in-situ and experimental environments. Results indicate that capture has species-specific effects, that post-release effects may last longer than 5 min, and that controlled experiments may not be reliable indicators of post-release effects. Immediate post-release swimming was not a good predictor of post-release behaviour, suggesting capture and release fisheries may have significant sub-lethal effects on some species of shark, and that limiting capture or handling time may reduce post-release effects.
机译：尽管已经对各种鲨鱼种类进行了释放后死亡率估计，但是人们对捕捞，处理和释放的短期亚致死作用知之甚少，并且大多在受控条件下进行了研究。另外，从未被证实过的关于释放后立即进行主动游泳是鲨鱼状况指示的观念。这项研究通过使用遥控车辆在受控条件下进行的复制实验分析了两种鲨鱼的后释放行为，评估了两种鲨鱼的释放行为，即拖板（Cephaloscyllium laticeps）和尖刺的刺腿狗（Squalus megalops）。 。总共有67条鲨鱼被深海拖网鱼和商业延绳钓捕捞，并经受着不同的甲板暴露和释放环境。暴露于甲板的鲨鱼的尾巴拍打率明显低于对照鲨鱼，但是这种效果在原位和实验环境之间是不同的。结果表明捕获具有物种特异性的作用，释放后的作用可能持续超过5分钟，并且受控实验可能不是释放后作用的可靠指标。释放后立即游泳并不能很好地预测释放后的行为，这表明捕捞和释放渔业可能会对某些鲨鱼产生重大的亚致死作用，限制捕捞或处理时间可能会降低释放后的影响。

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