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Master Thesis

Le programme de repeuplement de l’anguille : bilan de trois années de suivi

Abstract : The European eel is a species now considered as critically endangered. It is the subject of a European restoration plan since 2007, whereas it has long been considered in France as a pest. The restoration plan include a restocking program, which started in 2011 in France and is monitored for the first time in this study. This program consists in catching glass eels in estuarine waters, to reintroduce them on sites considered as favorable. The aim is to increase the breeding population migrating to the spawning sites. Over the period 2011-2013 have been released nearly 6.7 tonnes of glass eels, which represent nearly 20 million individuals on 28 release sites in North and Western France. Considering that this study occurs 6 months to 3 years after the stocking, it is not possible yet to conclude on the final silver eel production. Thus, other approaches have been chosen to bring the first clues necessary to answer to the question of the efficiency of this program. First, the factors influencing the short-term mortality were identified and their effects quantified in a GLM binomial model explaining almost 52% of the deviance. Then, it was shown that stocked individuals are still present in the environment, at least over the period of the study. These individuals shows recapture rates consistent with what was expected and grows, although a bit lower than what is reported in the literature. One of the major findings of this study tackles the subject of the marking used for the scientific monitoring. The latter generates an additional mortality (29%) and a lower growth (-9.9%) and should be limited as much as possible.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-01096400
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Submitted on : Wednesday, December 17, 2014 - 2:21:23 PM
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Quentin Josset. Le programme de repeuplement de l’anguille : bilan de trois années de suivi. Sciences agricoles. 2014. ⟨dumas-01096400⟩

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