A fisherman shared what it's like to catch an illegal fish that has made a harmful mark on U.S. ecosystems. "This is a 50-pound bighead carp, and it's officially the most invasive fish in the United ...

It’s been nicknamed Frankenfish. But it’s turning out to be more of a Superfish, with Lex Luthor attitude. The northern snakehead, a large Asiatic invasive species, has been expanding in Berks County ...