A Fond du Lac man went fishing for bluegill recently, when he reeled up a potentially-dangerous piranha. Richard Pardee caught it last Friday on Lake Winnebago. It was a large gray creature, about 12-and-a-half inches long. And in 45 years of fishing, Pardee said he never saw anything like it. He iced it, took it to pet shop, and a sales associate confirmed it was either a piranha or a pacu – both of which are native to South America. Piranha have sharp teeth, and they can go after both people and animals. The state D-N-R is not sure how it got there. But when foreign species are released into Wisconsin waters, senior biologist Kendall Kamke says the potential for disease is a big concern.