한국수산과학회

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  • 0374-8111
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  • 2287-8815

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kfas, vol. 54, no. 5, pp.751-760, October, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0751

Ozone-produced Oxidants Improve Water Quality Parameters and Microbial
Colony Counts in the Semi-Recirculating Aquaculture System for
Olive Flounder Paralichthys olivaceus
반순환여과양식시스템에서 오존 유래 잔류산화물이 넙치(Paralichthys
olivaceus) 사육수의 수질과 미생물에 미치는 영향

정상명·박우근·박성덕1·박정환2·김재원·김병기*
강원도립대학교 스마트양식과, 1강원도 환동해본부 수산정책과, 2부경대학교 해양바이오신소재학과

This study investigated the changes in water quality parameters and microbial colonies when ozone was applied to
a semi-recirculating aquaculture system (semi-RAS) for the olive flounder Paralichthys olivaceus (500 g in average
weight). Concentrations of ozone-produced oxidants (OPO) in rearing tanks were maintained at 0, 0.014, 0.025 mg/L
as Cl2 for 26 days. Except total ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, phosphate phosphorus, chemical
oxygen demand, and total suspended solids decreased significantly with increasing OPO concentration in daily
and weekly monitoring (P<0.05). Colony forming unit (CFU) counts of heterotrophic marine bacteria decreased in
an OPO concentration-dependent manner. Overall reduction rates of microbial colonies in the treatments were 80%
higher than those of the control (P<0.05). During the experiment, the OPO concentration-driven ozonation was reliably
practiced without any adverse effects on the animals cultured in semi-RAS. Considering the biohazard, operating
cost, and stability of ozonation, an OPO concentration of 0.014 mg/L would be sufficient to control water quality
parameters and microbial colonies in a semi-RAS.

Keyword : Ozone, Ozone-produced oxidants (OPO), Semi-recirculating aquaculture system, Microbial colony, Water quality

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