Despite the implementation of technical management measures to facilitate stock recovery of European sea bass, Dicentrarchus labrax (L.), the survival rate of discarded hook-and-line caught sea bass remains unknown. This makes the effectiveness of management measures that result in discarding difficult to assess. Therefore, a questionnaire was distributed to 421 UK-based commercial hook-and-line fishers (65 respondents) to characterise how sea bass are caught, handled and released. Responses suggested fishing was selective with a reported estimated mean discard rate of 12.9% (±3.3% SE). Low rates of foul and deep hooking, and short periods of air exposure were reported. Combined with data from a post-release mortality experiment using hook-and-line caught captive sea bass, a fleet-wide discard survival rate of 89.3% (±2.6% SE) was calculated for the UK commercial hook-and-line sea bass fishery. This survival rate suggests that technical management measures, for example minimum conservation reference sizes and catch limits, could be effective tools for managing the sea bass hook-and-line fishery.

中文翻译：

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估计英国商业钩线渔业中欧洲鲈鱼 (Dicentrarchus labrax) 的丢弃存活率

尽管实施了技术管理措施以促进欧洲鲈鱼的种群恢复，但Dicentrarchus labrax(L.)，丢弃的钩线钓鲈鱼的存活率仍然未知。这使得导致丢弃的管理措施的有效性难以评估。因此，我们向 421 名英国商业钩钓渔民（65 名受访者）分发了一份问卷，以了解鲈鱼的捕获、处理和释放方式。答复表明捕鱼是有选择性的，据报道估计平均丢弃率为 12.9%（±3.3% SE）。据报道，犯规和深钩以及短时间的空气暴露率低。结合使用钩钓捕获的圈养鲈鱼的释放后死亡率实验数据，计算出英国商业钩钓鲈鱼的全船队丢弃存活率为 89.3% (±2.6% SE)渔业。这个存活率表明技术管理措施，例如，最低保护参考规模和捕捞限制，可能是管理鲈鱼钓钓的有效工具。