Pysiological Responses of Diploid and Triploid Far Eastern Catfish, to Water Temperature Stress.

The aim of study is to contribute to this knowledge-base by investigating the respiratory function, the metabolic rate and the difference of physiological responses un-der low water temperature (20℃→15℃) stress be-tween diploid and triploid far eastern catfish, . During the 48 hrs of water temperature stress exposure time, the respiratory frequencies, CO and NH concentrations of diploid had higher values than those of triploid (<0.05). However, pH of triploid was higher than those of diploid (<0.05), and oxygen consumption rate was not different between diploid and triploid (>0.05). The level of plasma cortisol and plasma glucose of triploid was lower than those of the diploid (<0.05). However, in case of lactic acid, there were not significant between triploid and diploid (>0.05). These results suggest that diploid was more sensitive for low water temperature stress response than triploid in this species.