Canyoncreek thanks for the response I did see that after I posted. If I just have to guarantee that they won't leave my property. I guess I am ok by the time my pond is warm enough it is below full pool and we don't usually get enough rain to create over flow until it would normally be cold enough to cause mortality. The two ponds that I would put them in flow through two other ponds on my property with screens on all the spillways so I think I would be pretty safe