The effect of aeration rates on abalone (Haliotis squamata) juvenile culture in recirculating aquaculture system

Efficient oxygen supply is crucial for the successful cultivation of abalone (Haliotis squamata) in recirculating aquaculture systems (RAS). The aims of this study were to investigate the oxygen consumption rate of H. squamata and evaluate the effects of different aeration rates to determine the optimal flow rate for abalone nurseries. Four aeration flow rates (0.4, 0.8, 1.2, and 1.6 L min⁻¹) were tested using a completely randomized design with three replications. The abalone, with an initial average shell length of 27.26 ± 0.63 mm and weight of 3.27 ± 0.07 g, were reared in baskets (3 L) placed in a 60 L tank RAS for nine weeks. The results showed that the lowest production performance was observed at 0.4 L min⁻¹, while the highest production performance occurred at 1.6 L min⁻¹. Based on the production performance and physiological responses, it was concluded that an aeration rate of 1.6 L min-1 and DO saturation levels of 74.88–92.75% appeared beneficial for enhancing H. squamata juvenile production in RAS.