I live in Mauritius and the only animals I could worry about would be rats and cats (again, unlikely). We do have meerkats but the only thing they'll ever do (if they come in my yard, which is very unlikely) is eat turtle eggs. We do have a local freshwater turtle and they do not have natural predators.
Steve, I am not sure about their gender but I will base my pond size on two female adult RES anyway to have maximum space
It will be about 1m30 deep for the deepest part and 2m by 1m30. Dimensions might change but you get the general idea ! I did say I have a male and a female because that's what my neighbours told me, however the more it goes the more I think I have two females, but I'll be fixed when time goes. I know that if there's a male I might need to separate them if he becomes aggressive.