BM,
I'm not sure I would call Gambusia mobile. They are an easy target out away from shore. I'm guessing the reason they survive is they will try to hide in a 1/2 inch of water, under a leaf, if necessary to escape. A few always seem to escape and reproduce thousands more which are eaten. Kind of a neat fish, I think. Someone wrote once that they were egg stealers also, I believe. Maybe Bill Cody?
