CAN WATER PHOSPHORUS LEVEL IN RECIRCULATING AQUACULTURE SYSTEMS (RAS) COMPENSATE FOR LOW DIETARY PHOSPHORUS LEVEL IN NILE TILAPIA(Oreochromis niloticus)'!

摘要

Mineral requirements of fish can be met by minerals originating from the diets as well as from water. The importance of the latter depends on the concentration (e.g., fresh versus marine water). Fresh water fish cultured in recirculating aquaculture systems (RAS) with a low water refreshment rate can be exposed to relatively high water mineral concentrations. Little information is present, if water born minerals in freshwater can partially cover the mineral requirements of fish. Therefore, the current study assessed the impact of water phosphorous concentration in relation to dietary phosphorous content on phosphorous balance, performance and energy balances in Nile tilapia.