Fish dispersal from a sabotage-mediated massive escape event

This repository is for the data and scripts used in the analysis of the article published in Aquaclture Enviroment Interaction entitled "Fish dispersal from a sabotage-mediated massive escape event" by Javier Atalah, Pablo Sánchez-Jerez, David Izquierdo, Damián Fernandez-Jover, Pablo Arechavala-Lopez, Carlos Valle, Aitor Forcada, and Kilian Toledo-Guedes. ABSTRACT: Farm sabotage can cause massive fish escape events with significant ecological and socio-economic risks. This study examined the fate of Mediterranean seabass Dicentrarchus labrax escapees following a large-scale escape event caused by sabotage in the Western Mediterranean Sea. We monitored the escapee density and size structure over 3 mo after the escape at increasing distances from the escape point, up to 45 km away. Fish density adjacent to the escape location 5 d after the sabotage was, on average, 114 ± 44.7 (SE) fish per 100 m2. Our analyses showed that fish density decreased by 17% for every km away from the location, dropping to 2 and 1% after 1 and 2 mo, respectively, following the escape event. As escapee density declined throughout time and space, the size distribution of seabass shifted towards larger sizes. The rapid decrease in fish densities highlights the need for contingency plans focusing on fishing efforts in the coastal areas near the escape location (<20 km) within the first 24 h. These results are paramount to mitigating the risks associated with escape events cost-effectively. We emphasise the importance of sabotage prevention measures, such as security systems that can quickly detect intruders and trigger an immediate response to deter them. Additionally, enforcing appropriate sanctions based on the severity of the damage caused could help to discourage future sabotage attempts. KEY WORDS: Aquaculture · Mediterranean seabass · Dicentrarchus labrax · Coastal zone management · Marine policy本仓库收录了发表于《水产养殖环境交互（Aquaculture Environment Interaction）》的论文《人为破坏介导的大规模鱼类逃逸事件的鱼类扩散特征》的分析所用数据与脚本，论文作者为Javier Atalah、Pablo Sánchez-Jerez、David Izquierdo、Damián Fernandez-Jover、Pablo Arechavala-Lopez、Carlos Valle、Aitor Forcada及Kilian Toledo-Guedes。 摘要：水产养殖设施遭人为破坏可引发大规模鱼类逃逸事件，进而造成显著的生态与社会经济风险。本研究针对西地中海海域一起由人为破坏导致的大规模欧洲海鲈（Dicentrarchus labrax）逃逸事件，分析了逃逸个体的后续动向。研究于逃逸发生后的3个月内，在距逃逸点不同距离（最远达45km）的区域监测逃逸个体的密度与体长结构。逃逸事件发生5天后，逃逸点附近海域的鱼类密度均值为114±44.7（标准误，SE）尾/100㎡。分析结果显示，每远离逃逸点1km，鱼类密度即下降17%；逃逸后1个月和2个月时，鱼类密度分别降至初始水平的2%和1%。随着逃逸个体密度随时间与空间距离推移逐渐降低，海鲈的体长分布逐渐向更大体型偏移。鱼类密度的快速下降表明，需在逃逸事件发生后的前24小时内，针对逃逸点周边20km以内的近岸海域制定针对性捕捞应急方案。上述结果可为高效降低鱼类逃逸事件相关风险提供重要支撑。本研究强调了人为破坏预防措施的重要性，例如可快速侦测入侵者并触发即时驱离响应的安防系统。此外，根据破坏造成的损害程度实施相应处罚，也有助于遏制未来的人为破坏企图。 关键词：水产养殖；欧洲海鲈；Dicentrarchus labrax；近岸海域管理；海洋政策