30, 2019 3:28 p.m. The Pennsylvania Fish and Boat Commission confirmed Monday that an invasive species, the northern snakehead fish, was recently caught in the Monongahela River. It is the first ...

These fish have long dorsal fins that extend down most of their backs, giving them a streamlined shape perfect for fast swimming. The snakehead has an elongated, cylindrical body that can grow up ...

In summer, and in warmer conditions—which necessitates more oxygen—the fish solely breathes air though its suprabranchial organ. The northern snakehead is not alone in this ability ...