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首页> 外文期刊>ICES Journal of Marine Science >Effect of management measures on glass eel escapement
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Effect of management measures on glass eel escapement

机译：管理措施对鳗鱼逃逸的影响

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摘要

Stocks of European eel {Anguilla anguilla) have declined continuously and steadily, since 1980. A model, GEMAC, namely Glass Eel Model to Assess Compliance, has been developed with the objective of assessing anthropogenic impacts on glass eels in estuaries and evaluating the effects of management measures, to support initiatives aimed at helping the eel stocks recover. The model is described and applied to two estuaries with contrasting anthropogenic pressures: the Vilaine and the Garonne. It assesses the proportion of settled glass eels relative to a non-impacted situation with current (%S/R) or pristine recruitment (%S/R_0). The estimated %S/R (%S/R_0) is 5.5% (1.1%) for the Vilaine and 78% (19%) for the Garonne, in accord with the different levels of anthropogenic pressure in these two estuaries. A sensitivity analysis shows that the assessment of %S/R is accurate, and that in a data-poor context, the %S/R is under-assessed, as required by the precautionary approach. Seven management scenarios are explored all aiming to halve the anthropogenic pressure, but in fact leading to different levels of glass eel escapement, from almost zero to a 13-fold increase. This variation emphasizes the need for the estuarine context of eel stock management to be carefully evaluated for effectiveness when implementing management measures.
机译：自1980年以来，欧洲鳗{（Anguilla anguilla）的存量一直持续稳定下降。已开发出一种模型，即GEMAC，即评估合规性的玻璃鳗模型，其目的是评估人为对河口玻璃鳗的影响并评估河鳗的影响。管理措施，以支持旨在帮助鳗鱼种群恢复的举措。描述了该模型并将其应用于两个具有不同人为压力的河口：维拉因河和加龙河。它评估在当前（％S / R）或原始补充（％S / R_0）的情况下，相对于未受影响的情况，定居的玻璃鳗的比例。相对于这两个河口的不同的人为压力水平，维拉因的估计％S / R（％S / R_0）为5.5％（1.1％），加龙河为78％（19％）。敏感性分析表明，对％S / R的评估是准确的，并且在数据贫乏的情况下，按照预防性方法的要求，对％S / R的评估不足。探讨了七个管理方案，旨在将人为压力减半，但实际上导致了不同程度的玻璃鳗逃逸，从几乎为零增加到了13倍。这种变化强调了在实施管理措施时，应仔细评估河鳗种群管理在河口方面的有效性。

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