Effects of two different ozone doses on seawater recirculating systems for black sea bream Acanthopagrus schlegeli (Bleeker): Removal of solids and bacteria by foam fractionation

▶ Foam fractionators, with and without additional ozonation, were evaluated for their effect on solids removal (suspended solids, SS; volatile suspended solids, VSS; dissolved organic carbon, DOC), particle size distribution of the foam in seawater recirculating systems during a 44-day experimental period. ▶ Application of ozone at 20 g ozone/day improved solids removal and caused a significant decrease in bacteria counts. ▶ Foam generation was suppressed during the day because of oils in the fish diets so foam generation peaked several hours after the last daily feeding.