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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03467

    Diseases and parasites of wild and cultivated mussels along the Patagonian coast of Argentina, southwest Atlantic Ocean

    N. Vázquez*, A. Frizzera, F. Cremonte

    *Corresponding author:

    ABSTRACT: A histological survey of the commercially edible mussels, Mytlius platensis and M. chilensis, from wild and cultivated populations simultaneously along Patagonian coasts (42º00´S to 54º47´S), Argentina was carried out to determine their health status. Diagnostic results included three types of inflammatory responses (infiltrative, nodular and encapsulation), disseminated neoplasia disease, two abnormal reproductive conditions (gonadal atresia and intersex), prokaryotic inclusions, protozoans and metazoans. Pathogen prevalences and infection intensity among mussels of different sampling sites and between those of wild and cultivated populations were compared. Inflammatory responses were recorded in all mussels from all sites, while disseminated neoplasia only occurred in the most southern cultivated M. chilensis. Intracellular prokaryotic inclusions were broadly distributed in the mussels from both northern and southern Patagonian coasts. Ciliates showed highest prevalence among wild mussels from the colder waters of Bahía Brown. Turbellaria were recorded at higher prevalences in cultured mussels (41.7%) and trematode metacercariae occurred exclusively in intertidal wild mussels. None of the parasites found appears to be a problem to the fishery or farming, although disseminated neoplasia should be monitored. In addition, we found that mytilid species coexsisting with M. platensis (Aulacomya atra and Perumytilus purpuratus) at one location shared the same pathological conditions and parasite, which differed from those of M. platensis of a distant locality. These results suggest that pathological conditions and parasites were influenced more by ecological habit factors than by the species of mussels present, based on similar parasites assemblages found among closely related mytilid hosts in the same geographical area.