Effects of feed loading on nitrogen balances and fish performance in replicated recirculating aquaculture systems

► Replicated RAS study with 4 levels of feed loading (4-fold nitrate range up to 200 mg N/L). ► No fish mortality and similar, high feed utilization efficiency in all trials. ► Diurnal N-balance measurements in RAS before/after treatment compartments. ► Comprehensive water sampling and associated modeling of TAN.