at age 66 I probably should be embarrassed to be asking this, but then again, at age 66 it takes a lot to embarrass me these days ! So my question: how do fish get where they get? I'm talking pan fish here, or maybe even carp. I live in a primarily urban area, and there are a lot of retention lakes and canals, and I often drive by wondering, "Suppose they're any fish in there?" I suppose they would have to have been stocked at some point, eh? I guess, if there is the possibility of overflow from one to another during high water times, then fish could migrate from a stocked pond to one that hasn't been stocked. Maybe something could crawl out of the mud, lose a leg or two, grow some fins and evolve? I mean, fish don't spontaneously appear. Do they?