Research Document 1998/159
A review of potential impacts on wild salmon stocks from fish diseases attributed to farmed salmon operations
By G. Oliver and A.-M. MacKinnon
Abstract
The scientific literature presents evidence that infectious disease agents have impacted on wild and cultured populations of both salmonid and non salmonid fish. Disease caused by an infectious agent is a complex interaction between the pathogen, the host and the environment. Our knowledge of two of these factors, the pathogen and the host, is increasing rapidly but the exact role of the environment in the disease interaction equation is still relatively unknown. Infectious diseases present in the Atlantic Provinces that have impacted on Atlantic salmon (Salmo salar) will be reviewed. The various steps required before a disease can be established in a wild population will be described. Finally, the measures available to the industry to minimise the potential impact of cultured salmon diseases on wild population will be summarized.
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