Bowfin

Bowfin, large freshwater fish (Amia calva) of eastern North America, also known as the grindle, mudfish, or freshwater dogfish. It is sometimes referred to as a “living fossil” because it resembles a type of fish that can be traced back 130 million years. Its body may reach a length of 30 in (76 cm). Because it eats large numbers of valuable food fish, it is sometimes regarded as a pest.