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Histopathologic lesions in bivalve mollusks found in Portugal : etiology and risk factors
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Orientador(es)
Resumo(s)
: Bivalve mollusks are an important resource due to their socioeconomic value and to the
historical and genetic value of some species. Two nationally important oyster species-Portuguese
oyster (Crassostrea angulata) and Japanese oyster (Crassostrea gigas) from distinctive areas in Portugal
were studied to evaluate their sanitary status. Oysters were sampled from four different sites in
Portugal. Oysters collected from Japanese oyster populations were cultivated in a strong oceaninfluenced environment and Portuguese oyster populations were cultivated in wild-beds. The
histopathological examination of both oyster species revealed the presence of parasites in gills,
mantle epithelium, digestive gland tubules and connective tissue, with a moderate prevalence. In
both populations was observed hemocytosis in the connective tissue, edema and metaplasia in the
digestive gland and tissues necrosis. In wild populations from Sado and Mira estuaries the prevalence
of mud blisters and gill lesions were higher than from populations produced on 0.50 m tables from
mudflats. Biosecurity measures and diagnostic techniques are fundamental to control pathogenic
agents, including the identification of pathogens at an early stage in their life cycles. This will prevent
diseases and improve pathogen reduction on transport of animals from different countries and
regions to new production areas to avoid the transmission of diseases
Descrição
Research Areas: Engineering ; Oceanography
Palavras-chave
Bivalve mollusks Oysters Histopathology Parasites
Contexto Educativo
Citação
Pires D, Grade A, Ruano F, Afonso F. 2022. Histopathologic lesions in bivalve mollusks found in Portugal : etiology and risk factors. Journal of Marine Science and Engineering, 10(2):133. Doi: org/10.3390/jmse10020133
Editora
Basel, Switzerland