Ive caught em this year fishing the river with geo and his bro were both there big white thing with a massive tail...you release 'em I'll catch em haha...Brandon said:All of the replies to the story say that it is definitely NOT a pirahna but a PACU. Either way, must have been released eh? I've seen a lot of goldfish in the chicago river-probably dumped by people who didn't want them anymore. maybe some carp/goldfish hybrids will start showing up. actually i can't imagine they haven't already.