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The change of resting metabolism (RM) with rapid lowering of water temperature was studied in cultured red sea bream Pagrus major acclimatized at 25 and 15°C. The RM decreased with rapid lowering of water temperature from the habitat temperature to the range 10-9°C in the 15°C group (the group acclimatized to 15°C) and to the range 15-13°C in the 25°C group (the group acclimatized to 25°C). However, after RM reached the minimum level as the water temperature was lowered, the metabolism of both groups increased contrary to expectation. The inflection temperature of the 15°C group was lower than that of the 25°C group. However, the minimum level of RM showed no significant difference between the two groups. The temperature dependence of RM in the 15°C group was significantly larger than that in the 25°C group within the range from the habitat temperature to the inflection temperature. On the other hand, the reaction temperature dependence of Mf Mg2+-ATPase activity in the 15°C group was larger than that in the 25°C group within the same range of RM. This result of the reaction temperature dependence of Mf Mg2+-ATPase activity coincided with that of RM. We consider that the increase of metabolism in low temperature water might be caused by the increasing Ca2+ concentration around myofibrils.

nihon suisan gakkaishi/nippon suisan gakkaishi

The change of Resting Metabolism with the Rapid Lowering of Water Temperature on Cultured Red Sea Bream and the Effect of Habitat Water Temperature on the Change.