NOT INVASIVE Oscar fish may look like Indiana’s next “monster fish” headline, but the truth is they’re not invasive here at all. Our winters are simply too cold for them to survive outdoors, so any Oscar you see in Indiana is safe and sound in somebody’s aquarium. They’re tropical South American cichlids, and while they’re popular with fishkeepers because of their personality and intelligence, they can’t handle frozen ponds or icy rivers—Hoosier winters shut that idea down fast. But in other war