海水のオゾン処理による飼育水の殺菌効果とヒラメ(Paralichthys olivaceus)およびマツカワ(Verasper moseri)の生存率に及ぼす影響

オゾン

The effects of ozonized seawater on bacterial population and survival of cultured Japanese flounder (Paralichthys olivaceus) and barfin flounder (Verasper moseri) were investigated. The number of viable bacteria was reduced in more than 99.9 % and Vibrio sp. could not be detected after seawater was treated with total residual oxidants (TROs) of 0.5 or 1.0 mg/ l, for 8.5 minutes. TROs showed toxicity for fish; barfin flounder died 16 and 2 hours at TROs of 0.1 and 0.5 mg/ l, respectively. However, Japanese flounder could be cultured in ozonized seawater after removed of the TROs by charcoal, showing similar survival rates as fish cultured in U. V.-treated or non-treated seawater. Therefore, ozonization of seawater seem an effective methods for disinfection of fish culture water.