Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Effect of oxygen micro-bubble for the temperature and oxygen concentrations of fish farming facility

미세기포 액화산소가 가두리양식장의 수온 및 산소농도에 미치는 영향

  • AN, Na (Department of Ocean Environmental Sciences Chung-Nam National University) ;
  • LEE, Jeong Kyu (Department of Ocean Environmental Sciences Chung-Nam National University) ;
  • LEE, Jun Seok (Department of Ocean Environmental Sciences Chung-Nam National University) ;
  • CHOI, Keun-Hyung (Department of Ocean Environmental Sciences Chung-Nam National University)
  • 안나 (충남대학교 해양환경과학과) ;
  • 이정규 (충남대학교 해양환경과학과) ;
  • 이준석 (충남대학교 해양환경과학과) ;
  • 최근형 (충남대학교 해양환경과학과)
  • Received : 2020.07.27
  • Accepted : 2020.09.29
  • Published : 2020.11.30
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Abstract

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.

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