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本仓库用于存放发表于《水产养殖环境交互（Aquaculture Environment Interaction）》的论文《破坏介导的大规模鱼类逃逸事件的扩散特征》的分析所用数据与脚本，该论文作者为哈维尔·阿塔拉赫（Javier Atalah）、巴勃罗·桑切斯-赫雷斯（Pablo Sánchez-Jerez）、戴维·伊兹基尔多（David Izquierdo）、达米安·费尔南德斯-霍弗（Damián Fernandez-Jover）、巴勃罗·阿雷查瓦拉-洛佩斯（Pablo Arechavala-Lopez）、卡洛斯·巴列（Carlos Valle）、艾托尔·福卡达（Aitor Forcada）与基利安·托莱多-盖德斯（Kilian Toledo-Guedes）。 摘要：养殖场破坏行为可引发大规模鱼类逃逸事件，带来严重的生态与社会经济风险。本研究针对西地中海海域一起由破坏行为引发的大规模鱼类逃逸事件，追踪了逃逸的地中海海鲈（Dicentrarchus labrax）的后续动向。我们在逃逸事件发生后的3个月内，对逃逸点周边不同距离（最远至45公里）处的逃逸鱼类密度与体长结构进行了监测。破坏行为发生后5天，逃逸点邻近区域的鱼类密度平均为每100平方米114±44.7尾（标准误，SE）。分析结果显示，鱼类密度每远离逃逸点1公里便下降17%；逃逸事件发生后1个月和2个月时，密度分别降至初始水平的2%和1%。随着逃逸鱼类的密度随时间与空间距离逐渐降低，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，需制定应急预案，在逃逸事件发生后的前24小时内，针对逃逸点周边20公里以内的近岸海域开展捕捞作业。本研究结果对于以成本效益最优的方式降低逃逸事件相关风险至关重要。我们强调破坏行为预防措施的重要性，例如可快速检测入侵者并触发即时响应以震慑入侵者的安防系统。此外，根据造成的损害严重程度实施相应处罚，有助于遏制未来的破坏行为。 关键词：水产养殖、地中海海鲈（Dicentrarchus labrax）、海岸带管理、海洋政策