Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Physiological Responses of Gray Mullet Mugil cephalus to Low-pH Water

사육수의 pH변화가 숭어(Mugil cephalus)에 미치는 생리적 영향

  • Moon, Hye-Na (Department of Marine life Science, Jeju National University) ;
  • Park, Jin-Hee (Hanwha Hotels and Resorts) ;
  • Park, Cheonman (Department of Marine life Science, Jeju National University) ;
  • Namgung, Jin (Department of Marine life Science, Jeju National University) ;
  • Kim, Ki-Hyuk (Department of Marine life Science, Jeju National University) ;
  • Yeo, In-Kyu (Department of Marine life Science, Jeju National University)
  • 문혜나 (제주대학교 해양생명과학과) ;
  • 박진희 (한화 호텔&리조트) ;
  • 박천만 (제주대학교 해양생명과학과) ;
  • 남궁진 (제주대학교 해양생명과학과) ;
  • 김기혁 (제주대학교 해양생명과학과) ;
  • 여인규 (제주대학교 해양생명과학과)
  • Received : 2017.01.11
  • Accepted : 2017.03.23
  • Published : 2017.04.30
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Abstract

We examined changes in the physiological responses of gray mullet Mugil cephalus exposed to acidic seawater (pH 6.0, 6.5, 7.0) and normal seawater (pH 8.0, control) for 15 days. As pH decreased, survival rate and body weight also decreased. Levels of aminotransferase, total protein and triglycerides also differed significantly with changes in pH, presumably due to stress caused by exposure to acidic water. The level of osmotic pressure was significantly higher in the pH 6.0 group than in other groups. Superoxide dismutase was significantly higher in the pH 6.5 and 7.0 groups than in the pH 8.0 group, and glutathione level was lowest in the pH 6.0 group. We conclude that decreasing the pH level of seawater induces a stress response in fish, damaging their ability to control their hematological and osmotic pressure. Antioxidant enzymes are generally sensitive to osmotic stress; in this study, antioxidant activity significantly changed with pH level. These results indicate that physiological stress induced by exposure to acidification reduces survival rates and inhibits growth in M. cephalus.

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References

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