Mass mortality of mariculture fish due to high summer temperatures is a major issue in the mariculture industry in many coastal waters of Korea, yet measures to mitigate the impact are generally limited. We injected a micro-bubble of liquefied oxygen into the bottom of rockfish cages (about 6-8 m deep) in order to maximize the dispersal of micro-bubbled seawater and reduce fish mortality. The injection of low-temperature oxygen in micro-bubbles lowered the water temperature at the injection area by as much as 1℃ and increased dissolved oxygen concentration by 0.5 ppm. In early August, following a week with persistent high water temperature (above 28.5℃), there was an increase in fish mortality despite the micro-bubble system, which resulted in approximately 7% death of the total introduced fish population. However, this mortality appeared to be much lower than mortality reported in a neighboring mariculture facility (approximately 50% mortality). We also estimated the volume that can be recirculated with pumped seawater using a micro-bubble system. We suggest that this approach of injecting liquefied oxygen through a micro-bubble system may reduce fish mortality during high temperature periods.

서 론
재료 및 방법
    실험 해역
    실험 방법
    분석 방법
결과 및 고찰
    수온, 용존산소 변화
    양식장 박테리아 변화
    양식장 어류 폐사개체수 변화
    경제적 손실에 대한 재무분석
결 론
References

• 안나(충남대학교 해양환경과학과) | Na AN (Department of Ocean Environmental Sciences Chung-Nam National University)
• 이정규(충남대학교 해양환경과학과) | Jeong Kyu LEE (Department of Ocean Environmental Sciences Chung-Nam National University)
• 이준석(충남대학교 해양환경과학과) | Jun Seok LEE (Department of Ocean Environmental Sciences Chung-Nam National University)
• 최근형(충남대학교 해양환경과학과) | Keun-Hyung CHOI (Department of Ocean Environmental Sciences Chung-Nam National University) Corresponding author