ETS activity and oxyen consumption rate (R) of the Japanese eel,Anguilla japonica,were determined at different temperature (22，27 and 32 ℃) and ration levels (starvation,1%,2% and satiation).On satiation,the ETS activity and R increased with the increasing of temperature,but the R/AETS ratio was not significantly affected by temperature,with the value maintained at about 0.38.While at 27 ℃,the ETS activity,R and the R/AETS ratio increased with the increasing of ration level.The regression relation between ration level and R/ETS was:R/AETS=0.046 3 LR+0.249 5(r 2=0.823 2).