Abstract: Objective To investigate the changes of cytochrome oxidase(COX) and succinate dehydrogenase ( SDH) contents in Oncomelania hupensis(O. hupensis) under laboratory condition and temperature stress ( high temperature and low temperature). Methods O. hupensis snails were randomly divided into control group ( T = 20 ℃ ),low temperature group (T = 4 ℃ ) and high temperature group (T = 37 ℃ ). Soft tissues of the snails were taken at 24 h after treatment by the different temperature to measure the changes of COX and SDH level in each group. Results The content of COX and SDH in the soft tissues was (27. 11±2. 31) U / L,(21. 90± 0. 32) U / L and ( 21. 42± 1. 84) U / L;( 1. 30± 0. 002) U / L,( 1. 24±0. 05)U / L and (1. 12 ± 0. 02) U / L,respectively for the control,low temperature group and high temperature group. The difference was significant among groups( F= 10. 145,P<0. 05 for COX; F= 124. 624,P<0. 05 for SDH). Conclusion COX and SDH contents tend to decrease in the soft tissue of O. hupensis under temperature stress.

Key words: Oncomelania hupensis, Temperature stress, Cytochrome oxidase, Succinate dehydrogenase