ok here in san diego we see some aquarium kept fish in our local water but i think one of the big things that makes a huge difference, is in florida there is alot of flowing water, and up in the north east. here in socal all of our water impoundments are pretty much man made and just dont support alot of tropicals. our water impoundments are drinking water from the colorado. i think its the water exchange rate, just like in our tanks, more so then the climate. ive seen oscars in local lakes but never to survive or at least seen again. i actually caught an aro in the san diego river, and never seen another or heard of another. all of or fish are touched closly by man, like world record "fat" lmb that eat "stocked rainbow trout" during our harse winters! like they say,"only in cali"