期刊
JOURNAL OF FISH DISEASES
卷 45, 期 11, 页码 1721-1731出版社
WILEY
DOI: 10.1111/jfd.13694
关键词
Candidatus Clavichlamydia salmonicola; genetic lines; recirculation aquaculture systems; Salmo salar
资金
- Australian Society for Parasitology
- Fisheries Society of the British Isles
- SalmsonSmolt [17/KG/009]
This study investigated the prevalence and intensity of epitheliocystis infection in two strains of Atlantic salmon reared in flow-through and recirculation aquaculture systems in Ireland. The results showed that the infection was present throughout the rearing period and the intensity was correlated with gill lesions. There was a significant interaction between hatchery system and fish strain on the prevalence and intensity of gill epitheliocystis.
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.
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