水温低下によるマダイ収容可能密度の上昇

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Red porgy Pagrus major acclimated at 25°C were distressed at 10-12°C and died at 7-9°C, when water temperature was lowered at a rate of 0.2°C/min.The lowest temperature at which no fish is distressed was estimated to be 15°C, when water temperature was lowered at the rate of 0.2°C/min from the acclimated level (25°C) and then kept at the constant level for 24h.In control experiments in which water temperature was kept at the acclimated level (25°C) for 8h, the housing capacity (the highest density at which no fish died) was 50g/l. An increase of housing capacity by 4 times was attained, when the water temperature was lowered at the rate of 0.2°C/min to 20°C and then kept at the level for 8h. Drop in water temperature by 5°C reduced nitrite and ammonia accumulation in water to about half of that in the control experiments.
日本水産學會の論文