we catch these all winter up here. they're tough but need cold water. i kept one all summer as a kid in a kidde pool in the shade and he did fine. i fed him fresh killed minnows and he ate well. end of the summer i released him back to the lake i got him from. they're pretty neat. if you kept them below 70f they will do fine. they have been known to get up to 30lbs. maines record i believe is 23lbs.