Freshwater fish

Gars are an ancient group of ray-finned fish in the family Lepisosteidae. They comprise seven living species of fish in two genera that inhabit fresh, brackish, and occasionally marine waters of eastern North America, Central America and Cuba in the Caribbean, though extinct members of the family were more widespread. They are the only surviving members of the Ginglymodi, a clade of fish which first appeared during the Triassic period, over 240 million years ago, and are one of only two surviving groups of holosteian fish, alongside the bowfins, which have a similar distribution.

fish that live all or much of their lives in freshwater

species of fish

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Phareodus is a genus of freshwater fish from the Paleocene to Eocene of North America.

thumb|upright=1.35| Garra andruzzii showing the pale colour and lack of eyes typical of cavefish. The large red spot on the head is the blood-filled gills, visible through the semi-transparent [[gill cover]]

species of fish

Lycopteridae is an extinct family of freshwater osteoglossomorph ray-finned fishes.

species of fish