The sicklefin chub (Macrhybopsis meeki) is a species of ray-finned minnow fish in the family Cyprinidae.

[3] The name meeki is in honor of Seth Eugene Meek, a noted American fish biologist.

[4] In 1908, Stephen Alfred Forbes and Robert Earl Richardson suggested the binomial name Platygobio gracilis based on a specimen collected in Illinois, but this is clearly the same species described by Jordan and Evermann.

[4] It is fairly round and thickest around the nape (the area just in back of the head), and the body tapers significantly until it reaches the tail.

[5] In larger individuals, the lower lobe of the caudal fin is often black with a white edge.

[11] There are also taste buds in the mouth, which has led to speculation that the fish sorts food orally and spits out what is not edible.

[8] Dams have destroyed much of the sicklefin chub's habitat by slowing currents and allowing silt to precipitate from the water and cover the sand and gravel beds the fish prefers.

[13] The United States Fish and Wildlife Service (FWS) estimated in 2001 that it only inhabited about 54 percent of its former range.