The cornetfishes or flutemouths[3] are a small family, the Fistulariidae, of extremely elongated fishes in the order Syngnathiformes.

The family consists of a single genus, Fistularia, with four species, found worldwide in tropical and subtropical marine environments.

[4] Ranging up to 2 m (6.6 ft) in length, cornetfishes are as thin and elongated as many eels, but are distinguished by very long snouts, distinct dorsal and anal fins, and forked caudal fins whose center rays form a lengthy filament.

[5] Cornetfish are found in tropical and temperate marine waters around the world, in the Atlantic, Pacific, and Indian oceans.

They are often found in coastal waters over soft-bottomed areas like coral reefs, sand flats, and seagrass beds, where they feed on small fishes, crustaceans, and other invertebrates.