Examining Phosphorus in Effluents from Rainbow Trout (Oncorhynchus mykiss) Aquaculture

This report presents the results of an experiment studying Phosphorus levels in effluents from rainbow trout (Oncorhynchus mykiss) aquaculture. The conclusions were that fish feeds need to supply a certain amount of bioavailable forms of Phosphorus (P) in order for fish to grow normally, however, excessive P levels in aquaculture effluents pose a serious threat to a freshwater environment. Reducing dietary P increases the risk of P-deficiency and growth depression in fish. Critical considerations in effluent P reduction must include the following: the dietary requirement of P in the fish, the bio-availability (absorption) of P, and factors of how effluent P are produced