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acid akwakultuur ammonia animals antiserum aquaculture in South aquatic areas artificial biological filter Bolock breeding Bruton candidate species Cape carp catfish Clarias channel catfish cichlids Clarias gariepinus Clarias lazera Clariidae commercial common carp conservation cost crayfish crustacean cryopreservation density diet disease control dissolved oxygen economic effluent eggs environmental factors feed fertilization Finfish fish culture fish farming fish species Fisheries freshwater fish genetic grey mullet growth rate hatchery Hecht Hogendoorn hybrid important indigenous species infections Knysna larvae levels macrochir marine marron mortalities Natal natural nitrification nitrogen nutritional ongrowing Oreochromis mossambicus organisms oyster Paperna parasites pathogens Pisces ponds potential problems production programme protein rainbow trout Rand Afrikaans University rearing salmonid Schoonbee sharptooth sharptooth catfish South Africa spawning sperm stocks suitable Table tank tenuimanus tilapia culture Transvaal viral virus vitamin Waal water quality water temperature WNNR