AI Article Synopsis
- The oyster species Crassostrea gasar is a crucial food source and income for communities in Northeast Brazil's estuaries.
- Recent research revealed the presence of harmful parasites, specifically Perkinsus marinus and Perkinsus olseni, affecting these oysters, with a histopathological survey conducted over several months in 2011 and 2012.
- The study found that the protozoan parasite Perkinsus sp. was the most prevalent (48.9%) and caused significant damage to the oysters, marking the first report of another parasite, Perkinsus beihaiensis, in this oyster species.
Article Abstract
The oyster Crassostrea gasar is a species widely used as food and a source of income for the local population of the estuaries of Northeast Brazil. Perkinsus marinus and Perkinsus olseni are deleterious parasites for oyster farming and were recently detected in Brazil. In this study, a histopathologic survey of the oyster C. gasar cultured in the estuary of the River Mamanguape (Paraíba State) was performed. Adult oysters were collected in December 2011 and March, May, August and October 2012 and processed for histology and Perkinsus sp. identification by molecular analyses. Histopathological analysis revealed the presence of parasitic organisms including viral gametocytic hypertrophy, prokaryote-like colonies, protozoans (Perkinsus sp. and Nematopsis sp.) and metazoans (Tylocephalum sp. and cestodes). Other commensal organisms were also detected (the protozoan Ancistrocoma sp. and the turbellarian Urastoma sp.). The protozoan parasite Perkinsus sp. had the highest overall prevalence among the symbiotic organisms studied (48.9%), followed by Nematopsis sp. (36.3%). The other organisms were only sporadically observed. Only the protozoan Perkinsus sp. caused alterations in the oysters' infected organs. Molecular analyses confirmed the presence of P. marinus, P. olseni and Perkinsus beihaiensis infecting the oyster C. gasar. This is the first report of P. beihaiensis in this oyster species.
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| http://dx.doi.org/10.1017/S0031182014001863 | DOI Listing |
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