Abstract: Different temperature heating modes were designed to study the response of twosize scallops (10 months and 46 months old) at different high temperature levels (20, 22, 24, 26, 28 ℃) and their capabilities in resisting high temperature under different heating modes (slow heating and abrupt heating), and the survival rate, oxygen consumption rate and immune enzyme activity were investigated in this paper. In the slow heating pattern, scallops reared in 15 ℃ were acclimatized to the different temperature levels 20, 22, 24, 26 and 28 ℃ (temperature increased 1 ℃ per day), and then maintained for 15 days. In the abrupt heating pattern, the rearing temperature was increased from 15 to 20, 24, and 28 ℃ at a rate of 4 ℃ per day, and maintained for 1 day. The results showed that the survival rates of scallops decreased with increasing the temperature under the slow heating mode, and the survival rates of 46 and 10monthold scallops were 96.7% and 77.3% at 28 ℃ respectively. The 46monthold scallops had a significantly higher survival rate than the 10monthold ones when they were exposed to each temperature treatment (P<0.05). The twosize scallops had similar oxygen consumption changes under the test temperature treatments, firstly the oxygen consumption increase, followed by a quick decrease with rising the water temperature. The 10monthold scallops had a significantly higher oxygen consumption rate than the 46monthold ones when they exposed to 15-24 ℃ temperature (P<0.05). When water temperature reached 28 ℃, the oxygen consumption rates of 46 and 10monthold scallops both dropped to the lowest with values at 0.482 and 0.527 mg·g^-1·h^-1, respectively. The related immune enzyme activities of the twosize scallops also had a similar change at the variable temperatures, however, the 46monthold scallops had a significantly higher value for the immune enzyme activities than the smallsize ones when they were in the same treatment (P<0.05). In a word, our results suggested that the larger scallops had a stronger capability in resisting high temperature compared with smaller ones under different heating modes.

Key words: humanity well-being, supply and consumption, ecological red line., ecosystem ecology, empirical research