So, we know these species prefer tropical water temperature. But what's the lowest temp they will survive? I'm watching Jeremy wade on river monsters. He's fishing in Argentina and catching TSN and some form of giant piranha in what he says is "near freezing temperatures ". I ask because I would love to put my big cats in an outdoor pool in the spring and I'd like to know if they would survive in NC through the winter. From what I've researched,Argentinas water dips into the high 40's during winter. Thanks