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Écologie de la reproduction de l'huître Crassostrea gigas en lagune méditerranéenne

Abstract : The Mediterranean lagoons host many anthropogenic uses including shellfish aquaculture since the beginning of the 20th century. Imported in 1970, the cupped oyster, Crassostrea gigas, has adapted perfectly and has allowed an important development of oyster’s industry until 2008, the year of occurrence of spat outbreak related to the emergence of an Ostreid Herpes-virus µvar. The scarcity of spat and the speculation on this product changed regionally cultural practices and the supply of juveniles, with in particular the wish of developing a local activity of spat collection. However the cycle of reproduction of the species and the recruitment of juveniles were poorly known in lagoon environments. In this context, the objective of this thesis is to characterize the variability of the reproduction and the recruitment of the cupped oyster in Mediterranean lagoon. The lagoon configuration offers the advantages of productivity for the broodstock and hydrodynamic connectivity for the larvae. However, it appears that the ecological functioning of the system at the base of the primary production plays an essential role on the trophic resources for the success of oyster reproduction. This work takes place in the context of the ecological restoration under oligotrophication, which first effects we describe on the oyster's reproductive cycle.
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Submitted on : Friday, August 28, 2020 - 3:42:16 PM
Last modification on : Thursday, September 24, 2020 - 3:22:47 AM


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  • HAL Id : tel-02924971, version 1


Franck Lagarde. Écologie de la reproduction de l'huître Crassostrea gigas en lagune méditerranéenne. Biodiversité et Ecologie. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS470⟩. ⟨tel-02924971⟩



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