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

作者：Brandao Rosana Pinho; Boehs Guisla^*; da Silva Patricia Mirella

来源：REVISTA BRASILEIRA DE PARASITOLOGIA VETERINARIA, 2013, 22(1): 84-91.

DOI：10.1590/s1984-29612013005000007

• Oysters
• parasitism
• pathogen
• Bucephalus
• Nematopsis
• Bahia - Brazil

This study investigated the health of natural stocks of the oyster Crassostrea 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 Marau (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 by Nematopsis sp. which also caused histopathological changes. The presence of Bucephalus sp. caused parasitic castration. These two pathogens significantly affect the health of C. rhizophorae.

• 出版日期2013-3