Infectious diseases of coldwater fish in fresh water

The culture of coldwater fish in fresh water environments is practised globally and primarily involves salmonids. Cage culture of coldwater species in fresh water occurs in many areas, but is limited in terms of capacity and revenue when compared with marine net pen farming. Freshwater cage culture generally occurs in lakes, reservoirs, large rivers or manmade canals (Fig. 3.1a, b). Disease concerns are related to the life stages, but would mimic those experienced at other freshwater aquaculture sites that rear fish in earthen ponds, tanks or raceways.