Three parasite species, Anguillicola crassus (Nematoda), Myxidium giardi (Myxozoa) and Eimeria anguillae (Sporozoa) were recorded in the eel, Anguilla anguilla from the Mediterranean Lagoon of Mauguio (Southern France). A. crassus is found in the swim bladder, M. giardi in the kidney and E. anguillae in the intestinal cells of this bony fish. A comparative study of the temporal variations in the population structures of these three endoparasites has been undertaken. This study reveals : a) the
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