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首页> 外文期刊>ICES Journal of Marine Science >Estimating post-release mortality of European sea bass based on experimental angling
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Estimating post-release mortality of European sea bass based on experimental angling

机译：基于实验角度估算欧洲鲈鱼的释放后死亡率

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摘要

European sea bass (Dicentrarchus labrax) is an important target species for recreational and commercial fisheries. In recent years, the spawning stock biomass has declined markedly in some areas, and strict management measures have been introduced. However, the development of appropriate stock assessment and fisheries management has been hampered by a lack of information on post-release mortality. This study investigated post-release mortality of sea bass captured with common recreational fishing gear under experimental conditions in an aquaculture facility over 10 d. Three experiments investigated (i) the effects of different bait types; (ii) the impact of prolonged air exposure; and (iii) the impact of deep hooking on post-release mortality. By combining the experimental results with country-specific information on sea bass angling practices, estimates of post-release mortality are provided for the northern sea bass stock. No mortality was observed for sea bass captured on artificial baits. The use of natural baits resulted in a mortality of 13.9% (95% CI = 4.7-29.5%), which was associated with deep hooking, hooking injuries, and prolonged air exposure. The use of artificial baits and short air exposure (= 30 s) increased survival probability, whereas deep hooking resulted in 76.5% (95% CI = 50.0-93.2%) mortality. Depending on country-specific angling practices, post-release mortality estimates ranged from 2.8% to 9.1% (mean = 5.0%, 95% CI = 1.7-14.4%) for northern sea bass. Despite these relatively low mortality estimates, post-release mortality should be considered in stock assessments as its cumulative impact may be high. Moreover, post-release mortality can be reduced by implementing species-specific best practice guidelines.
机译：欧洲鲈鱼（Dicentrarchus labrax）是休闲和商业渔业的重要目标物种。近年来，某些地区产卵生物量显着下降，并采取了严格的管理措施。但是，由于缺乏有关释放后死亡率的信息，阻碍了适当种群评估和渔业管理的发展。这项研究调查了在水产养殖设施中超过10 d的实验条件下，在实验条件下用普通休闲捕鱼工具捕获的鲈鱼释放后的死亡率。研究了三个实验：（i）不同诱饵类型的影响； （ii）长时间接触空气的影响； （iii）深深地吸引了释放后的死亡率。通过将实验结果与特定国家/地区有关鲈鱼垂钓做法的信息相结合，可以估算出北部鲈鱼种群的释放后死亡率。没有观察到人工诱饵捕获的鲈鱼的死亡率。使用天然诱饵可导致13.9％的死亡率（95％CI = 4.7-29.5％），这与深深的钩挂，钩挂伤害和长时间的空气暴露有关。使用人造诱饵和短时间暴露于空气（<= 30 s）可提高生存率，而深深的勾引则可导致76.5％（95％CI = 50.0-93.2％）的死亡率。根据特定国家/地区的垂钓习惯，北鲈鱼的释放后死亡率估计范围为2.8％至9.1％（平均值= 5.0％，95％CI = 1.7-14.4％）。尽管这些死亡率估计值相对较低，但应在种群评估中考虑释放后的死亡率，因为其累积影响可能很大。此外，可以通过实施特定于物种的最佳实践准则来降低释放后的死亡率。

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