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首页> 外文期刊>ICES Journal of Marine Science >Quantifying 60 years of declining European eel (Anguilla anguilla L., 1758) fishery yields in Mediterranean coastal lagoons
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Quantifying 60 years of declining European eel (Anguilla anguilla L., 1758) fishery yields in Mediterranean coastal lagoons

机译：量化60年欧洲鳗el下降（Anguilla anguilla L.，1758）地中海沿海泻湖的渔业产量

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摘要

The European eel Anguilla anguilla is thought to be in a multi-decadal decline across its range. Although its northern Atlantic sub-populations are well-studied, little is known about the historical trend and current status of eel stock in the Mediterranean Sea. To fill this gap, we gathered catch data for 86 lagoon fisheries in nine countries across the Mediterranean basin and analysed historical trends and geographical and environmental patterns. We found a region-wide decline in eel catch, beginning in the mid-1970s and exceeding the simultaneous decline in non-eel fisheries, as well as lower productivity in larger lagoons and those in the southern Mediterranean. Additionally, we developed a population dynamics model to provide a preliminary estimate of pristine, potential, and actual escapement of spawning adults (silver eels) across the Mediterranean basin under historical and current conditions. Model results suggest that current escapement is 35% of escapement at pristine biomass levels,,40% target set by EC regulation 1100/2007. Furthermore, we estimate that a complete closure of lagoon fisheries would achieve 57% of pristine escapement under current recruitment levels. Though preliminary, this analysis represents a first step towards a full assessment of the role of the Mediterranean sub-population in overall eel stock recovery.
机译：欧洲鳗鳗被认为在整个范围内都处于十年下降的趋势。尽管已经对北部大西洋的亚种群进行了深入研究，但对地中海鳗鱼种群的历史趋势和现状知之甚少。为了填补这一空白，我们收集了整个地中海盆地九个国家中86个泻湖渔业的捕捞数据，并分析了历史趋势以及地理和环境格局。我们发现，从1970年代中期开始，整个地区的鳗鱼捕捞量都下降了，超过了非鳗鱼渔业的同期下降，以及大型泻湖和地中海南部地区的生产力下降。此外，我们开发了种群动态模型，以提供历史和当前条件下整个地中海盆地的产卵成年幼体（银鳗）的原始，潜在和实际逃逸的初步估计。模型结果表明，当前擒纵力是原始生物质水平擒纵力的35％，是EC法规1100/2007设定的40％目标。此外，我们估计，在目前的招聘水平下，完全关闭泻湖渔业将实现原始捕捞量的57％。尽管是初步的，但该分析代表了朝着全面评估地中海亚种群在总体鳗鱼种群恢复中的作用迈出的第一步。

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