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BIBTEX RIS

Health assessment of the oyster Crassostrea rhizophorae on the southern coast of Bahia, northeastern Brazil

2013; Colégio Brasileiro de Parasitologia Veterinaria; Volume: 22; Issue: 1 Linguagem: Inglês

10.1590/s1984-29612013005000007

ISSN

1984-2961

Autores

Rosana Pinho Brandão, Guisla Boehs, Patrícia Mirella da Silva,

Tópico(s)

Marine Bivalve and Aquaculture Studies

Resumo

This study investigated the health of natural stocks of the oysterCrassostrea rhizophorae on the southern coast of Bahia in northeastern Brazil, during summer and winter 2010, at three localities (sampling points) in the estuaries of the Maraú (Camamu Bay) and Graciosa rivers. A total of 180 oysters (30/sampling point/season) were examined macroscopically for the presence of pathogens and anatomical changes. The specimens were subsequently fixed in Davidson solution, processed for paraffin embedding, sectioned and stained with Harris' hematoxylin and eosin. Histological analysis revealed the presence of Rickettsia-like organisms (RLOs), Ancistrocoma,Trichodina, Sphenophrya,Nematopsis, Urastoma,Bucephalus in the sporocyst phase, a nonspecific metacercaria, and a metacestode of genus Tylocephalum. The prevalence of infection was low except for parasitism byNematopsis sp. which also caused histopathological changes. The presence of Bucephalus sp. caused parasitic castration. These two pathogens significantly affect the health of C. rhizophorae.

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