The lake they were looking at is lake of the ozark its near my house.the lake is fed by a heated spring that's always 59-60 degrees.the lake gets much colder except the spring fed area.unless the piranhas returned to the spring fed end of the lake during winter it wouldn't make it. I have seen a photo of a actual piranha that was caught there it wasn't a pacu.supposedly piranhas have been caught there the last 3 years in a row.it sure would be nice to go right up the road to get me some local wild stock but highly unlikely.lol. Someones turned some pets loose n fishermen have caught the extremely hungry pets.or the whole piranha in ozark lake is just BS! This is exactly why hobbyists n wannabe hobbyists should NEVER turn pets loose!its a good way to get our beloved piranhas banded in more states! All we need is a couple lawmakers cryn from untrue n misinformed reports n our fish could be in jeopardy!oh n don't look at me!I haven't turn sh%t loose!lol