Nocardiosis in tank‐reared Atlantic salmon, Salmo salar L.

• Published in: Journal of Fish Diseases
• Main Authors: Bransden, M P., Carson, J., Munday, B L., Handlinger, J H., Carter, C G., Nowak, B F.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2000
• Subjects: Austin; Dunbar; Kira; Myers; Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1046/j.1365-2761.2000.00201.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2761.2000.00201.x; https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2761.2000.00201.x; https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-2761.2000.00201.x

Nocardiosis is an infection caused by aerobic Gram‐positive, branching, filamentous rods of the genus Nocardia . The organism is resident in both soil and plants ( Austin & Austin 1993 Frerichs 1993 ), and is closely related to Mycobacterium spp. Nocardiosis caused by Nocardia asteroides and N. seriolae (previously N. kampachi ) has been reported in several finfish species, both freshwater and marine. The first reported incidence was recorded by Valdez & Conroy (1963) in neon tetras, Hyphessobrycon innesi (Myers), and subsequently in other fish species, some of commercial significance including rainbow trout, Oncorhynchus mykiss (Walbaum) ( Snieszko, Bullock, Dunbar & Pettijohn 1964 ), brook trout, Salvelinus fontinalis (Mitchill), ( Campbell & MacKelvie 1968 ) and yellowtail, Seriola quinqueradiata (Temminck & Schlegel; Kubota, Kariya, Nakamura & Kira 1968 ). Despite two of these incidences occurring in salmonids, infection by Nocardia spp. in Atlantic salmon, Salmo salar L., has not previously been reported.