한국수산과학회

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kfas, vol. 50, no. 2, pp.153-159, April, 2017
DOI. http://dx.doi.org/10.5657/KFAS.2017.0153

Physiological Responses of Gray Mullet Mugil cephalus to Low-pH Water 사육수의 pH변화가 숭어(Mugil cephalus)에 미치는 생리적 영향

문혜나·박진희1·박천만·남궁진·김기혁·여인규*
제주대학교 해양생명과학과, 1한화 호텔&리조트

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.

Keyword : Ocean acidification, pH stress, Gray mullet, Physiological response, Antioxidative activity

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