Abstract:Exopalaemon carinicauda is one of the marine aquaculture species with high economic value in China.This paper studied the effects of cryopreservation(-196 ℃)on the enzyme activity(SDH,LDH,Na+K+-ATP,SOD,CAT,GR and Acrosin)in E.carinicauda spermatozoa,in order to provide a theoretical basis for cryopreservation effect on E.carinicauda spermatozoa,and lay a foundation for artificial propagation of E.carinicauda.We set up a control group(without cryoprotectant),and three experimental groups(DMSO(V/V)10%,12.5%,15%),detected the enzyme activities on day 0,1,3,5,7,15.The result showed that,after cryopreservation,in addition to GR,the other enzyme activities decreased significantly(P<0.05),with the biggest drop in the control group.GR activity significantly increased in 7 days,and the control group was significantly higher than the experimental group(P<0.05),declining again in 15 days.The group of 15% DMSO measured enzyme activities were higher than other groups,indicating that 15% DMSO had protective effect on enzyme of spermatozoa.15 days later,under the condition of 15% DMSO,the activities of SDH,LDH and Na+/K+-ATPase decreased from(28.500±1.453)U/mL,(1290.836±27.603)U/L and(2.605±0.232)μmol/(mg?h)to(15.300±0.950)U/mL,(363.713±13.943)U/L and(0.542±0.186)μmol/(mg?h)respectively;the activities of SOD and CAT decreased from(106.497±7.217)U/mL,(383.632±4.731)U/g to(17.036±0.321)U/mL and(166.940±1.910)U/g respectively;the activities of acrosin decreased from(3.521±0.010)μIU/106 to(1.212±0.043)μIU/106;but the activities of GR increased from(217.042±6.962)U/L to(302.787±24.558)U/L.From the decline range,cryopreservation had the biggest influence on SOD,followed by Na+/K+-ATPase.