The best w ater temperature ranges f rom 20 ℃ to 25 ℃ for Amp ullar ia gigas culture , and the suitable air temperature ranges f rom 20 ℃ to 35 ℃ fo r ova hatching .There is ex tremely g reat negative correlation betw een hatching time and average temperature of ova w ith correlation coef ficient r =-0 .942 .Amp ullaria gigas can no t live through winter under natural ecological conditions north to Changsha , but can live if the temperature of water is kept above 10 ℃ in winter .Mature and young Amp ullar ia gigas can lie dormant for three months w ith 57 . 6 % of survival rate without w ater in laboratory under air temperature 2 -17 ℃, but can not survive out of laboratory in winter .