Learn about the alligator gar, a giant freshwater fish with a long snout and sharp teeth. Find out its scientific name, distribution, diet, predators, and more. The alligator gar is a close relative of the bowfin species. It is a ray-finned euryhaline fish and is one of the biggest freshwater fish in North America The alligatorfish (Aspidophoroides monopterygius), also known commonly as the Aleutian alligatorfish and the Atlantic alligatorfish ,[2] is a fish in the family Agonidae. [3] It was described by Marcus Elieser Bloch in 1786. [4] It is a marine, temperate water-dwelling fish which is known from the northwestern Atlantic Ocean, including western Greenland; Labrador, Canada; and Cape Cod, Massachusetts, USA. It dwells at a depth range of 0–695 metres, most often around 60–150 m, and inhabits ... This "living fossil" can grow as large as an alligator , has two rows of needle-sharp teeth, and such strong armor that it survived predatory dinosaurs.