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양식넙치 ( Paralichthys olivaceus ) 의 생리조건에 미치는 연속적인 수온 급강하의 영향
장영진(Young Jin Chang),이복규(Bok Kyu Lee),강덕영(Duk Young Kang),박명룡(Myong Ryong Park) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.5
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, threafter back to the initial temperature after 5 day. 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^-, K^+, 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.