Abstract: In order to understand the tolerance of Mytilus coruscus to dry exposure in different temperature and humidity or dry conditions, we measured the juvenile with the shell length of (4.43±0.76)mm and (10.16±0.43)mm. The experiments were performed at low temperature (1℃,2℃, 4℃ and 8℃) and high temperature (30℃, 32℃ and 34℃) with the condition of being dry and moist, respectively. The results showed that the survive rate of juveniles after exposure and desiccation had a negative correlation with the time of the tolerance under the same humidity (P<0.05). And the semilethal time was 45-91 h at 1-8℃, while 17-23 h at 30-34℃. The endurance of juveniles to exposure and desiccation under low temperature was more than triple under high temperature. The ability to survival of large size of M. coruscus was stronger than that of the small size one. The semilethal time of small size juveniles was 70-79 h， while the semilethal time of lager size was 76-91 h at 4℃. The survival rate of M. coruscus under moisturizing conditions is higher than that in drying conditions (P<0.05). The survival rate about the group of rewet with slow change in temperature was higher than the quick change in temperature group after air expose in low temperature, but the result after high temperature exposure was the opposite. Research results that the optimal transportation condition of Mytilus coruscus was air exposured under moisture condition at 4℃. In this way, the survival rate could be guaranteed more than 90% in 24 h.

Key words: Mytilus coruscus, ability of enduring exposure and desiccation, high temperature tolerance, humidity, temperature