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양식넙치(Paralichthys olivaceus)의 생리조건에 미치는 연속적인 수온 급강하의 영향
강덕영,박명롱,이복규,장영진 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1
Physiological responses of cultured olive flounder (Paralichthys olivaceus) on lowering seawater temperature sharply and continuously were studied with 4 experiments of temperature changes (Exp.Ⅰ∼Ⅳ). In Exp.Ⅰ, the temperature was decreased from 18℃ to 9℃ by the rate of 1℃/hr, thereafter back to the initial temperature after 5 days. With the same conditions of temperature rate and 5 days interval, the temperature changes for Exp. Ⅱ, Ⅲ and Ⅳ were 20℃ to 17℃, 23℃ to 14℃ and 23℃ to 17℃, respectively. Serum cortisol and glucose were measured during whole experiments. Hematocrit(Ht), hemoglobin(Hb), red blood cell(RBC), and mean corpuscular hemoglobin concentration(MCHC) were measured in the Exp.Ⅰ, and osmolality, electrolytes(Na^+, Cl^-, Ka^+, Ca^2+), total protein, aspartate aminotransferase(AST) and alanine aminotransferase(ALT) of serum, in Exp.Ⅱ∼Ⅳ. Serum cortisol levels were significantly increased by the lowering temperature sharply during whole experiments, while serum glucose levels were increased only in Exp.Ⅲ and Ⅳ. Ht, RBC and Hb were decreased as the water temperature was lowered, but MCHC was increased. The serum osmolality was reduced and the unstable changes of electrolytes were shown by the changes of seawater temperature. No significant changes in total protein, ALT and AST activity were observed.
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