They can pose a passive danger, though: The fish’s eggs are poisonous to humans if ingested. DefensesĪlthough they may look ferocious, alligator gars pose no threat to humans and there are no known attacks on people. It may obtain as much as 70 percent of the oxygen it needs from the atmosphere. It also allows the fish to gulp air to “breathe” in waters with low oxygen.

The fish’s thick, spongy, and highly vascular air bladder behaves like a lung to aerate the alligator gar’s blood. Today alligator gars are known only to live in the lower Mississippi River Valley, from Oklahoma to the west, Arkansas to the north, Texas and portions of Mexico to the south, and east to Florida.Īlligator gars are able to tolerate brackish and even salt water, but they prefer the sluggish pools and backwaters of large rivers, swamps, bayous, and lakes. Alligator gars were historically found throughout the Mississippi River Valley and may have even existed as far north as Iowa and as far west as Kansas and Nebraska. Today, however, gars live only in North and Central America.

The prehistoric relatives of the species first appeared 157 million years ago and inhabited many parts of the world. (The white sturgeon is often considered North America’s largest freshwater fish, but it spends substantial time in salt water.) Range and habitat This makes it the largest fish species in North America that spends almost all its time in freshwater. It can grow up to 10 feet long, and historical reports suggest it may grow to weigh nearly 350 pounds. The largest of seven known gar species, this megafish has a torpedo-shaped body in olive brown and comes armored with glistening scales. The alligator gar bears no relation to alligators, but with its wide, crocodilian head and razor-sharp teeth, it’s easy to see how this giant fish got its name.

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