the northern snakehead has little sacs above its gills that function almost like lungs; the fish can surface and suck air into the sacs, then draw oxygen from the stored air as it swims.

However, snakeheads can also use their gills to respire underwater, which they often do in the winter months. In summer, and in warmer conditions—which necessitates more oxygen—the fish solely ...

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 ...

Although carnivorous fish have long been important in aquatic ecosystems, one invasive and aggressive predator has been ...