page_title: Gar
section_title: Scales
hierarchical_section_title: Gar / Anatomy / Scales
caption_attribution_description: English: Fossil specimen of an Atractosteus species extinct gar
context_page_description: Gars are members of the Lepisosteiformes, an ancient holosteian order of ray-finned fish; fossils from this order are known from the Late Jurassic onwards. The family Lepisosteidae includes seven living species of fish in two genera that inhabit fresh, brackish, and occasionally marine, waters of eastern North America, Central America and the Caribbean islands. Gars have elongated bodies that are heavily armored with ganoid scales, and fronted by similarly elongated jaws filled with long, sharp teeth. Gars are sometimes referred to as "garpike", but are not closely related to pike, which are in the fish family Esocidae. All of the gars are relatively large fish, but the alligator gar is the largest – the alligator gar often grows to a length of over 2 m and a weight of over 45 kg, and specimens of up to 3 m in length have been reported. Unusually, their vascularised swim bladders can function as lungs, and most gars surface periodically to take a gulp of air. Gar flesh is edible and the hard skin and scales of gars are used by humans, but gar eggs are highly toxic.
context_section_description: Gar bodies are elongated, heavily armored with ganoid scales, and fronted by similarly elongated jaws filled with long, sharp teeth. Their tails are heterocercal, and the dorsal fins are close to the tail.
caption: Atractosteus fossil
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