Preliminary results of ozone disinfection of seawater containing the potential shrimp pathogens vibrio. sp. and fusarium solani

Studies to determine the feasibility of using ozone to disinfect seawater for use in controlled environment shrimp culture were run at the University of Arizona-University of Sonora Environmental Shrimp Culture Station at Puerto Peflasco, Mexico. Ozone was injected into seawater containing known natural populations of Vibrio spp. and known introduced populations of Fusa rium solani. Total residual oxidant (TRO) concentrations and total viable plate counts for these pathogens were made during and post ozonization. TRO at a concentration of 2.6 mg/1 was sufficient to kill greater than 99.9% of the Vibrio spp. present in the seawater within a 5-min exposure period. Greater than 99.9% of the introduced conidiospores of F.solani were killed within 5 minutes after exposure to approximately 2.1 mg/1 TRO.