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angling animal protein approximately automatic feeder back channel baskets bottom brood stock Brown trout cage structures chemical circulating tanks clean commercial concrete container Danish Danish-type density developed diet disease disinfected drain dry food earth ponds eggs elbow pipe feeding period fin rot fins fish farm fish farmer fish food Fish screens floatation floating flow formalin fresh water freshwater fry feeding fry tanks full sea water gill grading growth hatchery incubation infected intake large fish larger fish live fish malachite green mesh method offish oxygen parasites parent fish particularly pectoral fins pellets pipe plastic possible protein protozoan pump Raceways Rainbow trout farming reared salmon salmonid salmonid fish salt water saltwater production screen smolt solution species stage summer Symptoms table market thiaminase thiamine throughput of water tonnes treatment trough trout production usually Vitamin water supply water temperature wet food winter young fish