Prevalence of epitheliocystis in freshwater Atlantic salmon reared in flow-through and recirculation aquaculture systems.

Autor: Quezada-Rodriguez PR; Livestock and Aquaculture, Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, Hobart, Tasmania, Australia.; Institute for Marine and Antarctic Studies, University of Tasmania, Launceston, Tasmania, Australia., Taylor RS; Livestock and Aquaculture, Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, Hobart, Tasmania, Australia., Downes J; Marine Institute, Oranmore, Ireland., Egan F; Marine Institute, Oranmore, Ireland., White S; Marine Institute, Oranmore, Ireland., Brenan A; Marine Institute, Oranmore, Ireland., Rigby M; Livestock and Aquaculture, Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, Hobart, Tasmania, Australia., Nowak BF; Institute for Marine and Antarctic Studies, University of Tasmania, Launceston, Tasmania, Australia., Ruane NM; Marine Institute, Oranmore, Ireland., Wynne JW; Livestock and Aquaculture, Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, Hobart, Tasmania, Australia.
Jazyk: angličtina
Zdroj: Journal of fish diseases [J Fish Dis] 2022 Nov; Vol. 45 (11), pp. 1721-1731. Date of Electronic Publication: 2022 Aug 25.
DOI: 10.1111/jfd.13694
Abstrakt: Epitheliocystis, an intracellular bacterial infection in the gills and skin epithelium, has been frequently reported in Atlantic salmon (Salmo salar) during freshwater production in a number of countries. This study describes the prevalence and intensity of a natural epitheliocystis infection present in the gills of two strains of Atlantic salmon reared in either a flow-through (FT) or a recirculation aquaculture system (RAS) in Ireland. Repeated sampling of gills prior to and throughout seawater transfer, histology and quantitative real-time PCR were used to determine infection prevalence and intensity. Despite no clinical gill disease, and minor histopathological changes, epitheliocystis lesions were identified in histology at all time points. Specific PCR confirmed the presence of Candidatus Clavichlamydia salmonicola in both strains and its number of copies was correlated with intensity of epitheliocystis lesions. A significant interaction between hatchery system and fish strain on the prevalence and intensity of gill epitheliocystis was found both using histological and molecular methods. Specifically, fish from FT had higher prevalence and intensity than RAS reared fish and within FT, the Irish cohort were more affected than Icelandic.
(© 2022 CSIRO. Journal of Fish Diseases published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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