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Occurrence and Distribution of Aeromonas salmonicida Infections on Swedish Fish Farms, 1951–1987
Author(s) -
Wichardt UlfPeter,
Johansson Nils,
Ljungberg Olle
Publication year - 1989
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1989)001<0187:oadoas>2.3.co;2
Subject(s) - salmo , aeromonas salmonicida , rainbow trout , biology , salvelinus , outbreak , arctic char , brown trout , epizootiology , fishery , salmonidae , zoology , transmission (telecommunications) , subclinical infection , trout , fish <actinopterygii> , virology , electrical engineering , engineering
The occurrence of typical and atypical Aeromonas salmonicida infections on Swedish fish farms was surveyed, and the methods for controlling the disease are described here. This review is based on data for a period of 36 years from fish health control studies conducted by the National Veterinary Institute and the Salmon Research Institute. The epizootiology and routes of transmission of the pathogens are described, and policy and methods for disease control are discussed. The distribution of atypical A. salmonicida infections was entirely different from that of typical infections. There was also circumstantial evidence of different routes of transmission for typical and atypical A. salmonicida infections. Although subclinical carriers of atypical A. salmonicida occurred among Atlantic salmon Salmo salar and rainbow trout Oncorhynchus mykiss on fish farms, acute disease outbreaks were most frequent among Arctic char Salvelinus alpinus and brown trout Salmo trutta . On the other hand, acute outbreaks of typical A. salmonicida infections were frequent among Atlantic salmon and rainbow trout.