A method of raising fish in a recirculated aquaculture system abbreviated RAS, comprising a fish holding unit in fluid communication with a water supply , the fish holding unit containing a volume of water defining a water depth ( D ), the water in the fish holding unit having an osmotic concentration, a conductivity, an oxygen concentration, a CO 2 concentration, a N 2 concentration, a NH 4 + concentration, a temperature, and a pH, the recirculated aquaculture system further comprising a recirculation conduit , the method comprising the steps of: monitoring at least one parameter selected from the osmotic concentration, the conductivity, the oxygen concentration, the CO 2 concentration, the N 2 concentration, the NH 4 + concentration, the temperature and the pH of the water in the fish holding unit ; providing a flow of non-recirculated water to the water supply and providing a difference in the at least one parameter of the non-recirculated water of: i) an osmotic concentration difference of at least 1 mOsm/kg; ii) a conductivity difference of at least 0.01 μS/cm; iii) an oxygen concentration difference of at least 0.05 mg/kg; iv) a CO 2 concentration difference of at least 0.05 mg/kg; v) a N 2 concentration difference of at least 0.05 mg/kg; vi) a NH 4 + concentration difference of at least 0.05 mg/kg; vii) a temperature difference of at least 0.1 °C; and viii) a pH difference of at least 0.1 compared to the at least one parameter of the water of the fish holding unit ; providing feed pellets; and adding the feed pellets to the non-recirculated water and hydraulically transporting the feed pellets to the fish holding unit . monitoring at least one parameter selected from the osmotic concentration, the conductivity, the oxygen concentration, the CO 2 concentration, the N 2 concentration, the NH 4 + concentration, the temperature and the pH of the water in the fish holding unit ; providing a flow of non-recirculated water to the water supply and providing a difference in the at least one parameter of the non-recirculated water of: i) an osmotic concentration difference of at least 1 mOsm/kg; ii) a conductivity difference of at least 0.01 μS/cm; iii) an oxygen concentration difference of at least 0.05 mg/kg; iv) a CO 2 concentration difference of at least 0.05 mg/kg; v) a N 2 concentration difference of at least 0.05 mg/kg; vi) a NH 4 + concentration difference of at least 0.05 mg/kg; vii) a temperature difference of at least 0.1 °C; and viii) a pH difference of at least 0.1 i) an osmotic concentration difference of at least 1 mOsm/kg; ii) a conductivity difference of at least 0.01 μS/cm; iii) an oxygen concentration difference of at least 0.05 mg/kg; iv) a CO 2 concentration difference of at least 0.05 mg/kg; v) a N 2 concentration difference of at least 0.05 mg/kg; vi) a NH 4 + concentration difference of at least 0.05 mg/kg; vii) a temperature difference of at least 0.1 °C; and viii) a pH difference of at least 0.1 compared to the at least one parameter of the water of the fish holding unit ; providing feed pellets; and adding the feed pellets to the non-recirculated water and hydraulically transporting the feed pellets to the fish holding unit . <EOS>