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High Post-Capture Survival for Sharks, Rays and Chimaeras Discarded in the Main Shark Fishery of Australia?

机译：在澳大利亚的主要鲨鱼捕捞中被捕捞的鲨鱼，射线和奇马鱼的捕捞后存活率较高？

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Most sharks, rays and chimaeras (chondrichthyans) taken in commercial fisheries are discarded (i.e. returned to the ocean either dead or alive). Quantifying the post-capture survival (PCS) of discarded species is therefore essential for the improved management and conservation of this group. For all chondrichthyans taken in the main shark fishery of Australia, we quantified the immediate PCS of individuals reaching the deck of commercial shark gillnet fishing vessels and applied a risk-based method to semi-quantitatively determine delayed and total PCS. Estimates of immediate, delayed and total PCS were consistent, being very high for the most commonly discarded species (Port Jackson shark, Australian swellshark, and spikey dogfish) and low for the most important commercial species (gummy and school sharks). Increasing gillnet soak time or water temperature significantly decreased PCS. Chondrichthyans with bottom-dwelling habits had the highest PCS whereas those with pelagic habits had the lowest PCS. The risk-based approach can be easily implemented as a standard practice of on-board observing programs, providing a convenient first-step assessment of the PCS of all species taken in commercial fisheries.
机译：在商业性渔业中捕捞的大多数鲨鱼，chi鱼和美洲驼（软骨鱼类）都被丢弃（即死后或活着返回海洋）。因此，量化丢弃物种的捕获后存活率（PCS）对于改善该群体的管理和保护至关重要。对于在澳大利亚主要鲨鱼渔业中捕捞的所有软骨鱼类，我们对到达商业鲨鱼刺网渔船甲板的个人的即时PCS进行了量化，并应用了基于风险的方法来半定量确定延迟和总PCS。即时，延迟和总PCS的估计值是一致的，对于最常见的丢弃物种（杰克逊港鲨鱼，澳大利亚长尾鲨和棘手的dog鱼）来说很高，而对于最重要的商业物种（胶粘和学校鲨鱼）则很低。增加刺网浸泡时间或水温会显着降低PCS。习惯于底栖的软骨鱼类的PCS最高，而中上层习惯的软骨鱼类的PCS最低。基于风险的方法可以很容易地实现为船上观测计划的标准做法，从而为商业渔业中所有物种的PCS提供便利的第一步评估。

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