The riffle chub (Algansea aphanea) is a species of freshwater fish in the family Cyprinidae that is endemic to the Armería, Ayutla and Tuxpan river basins in Jalisco and Colima of west-central Mexico.

[1][2] This threatened species is generally found in small rivers and streams in fast-flowing waters that are 18–22 °C (64–72 °F).

It typically is 5–10 cm (2–4 in) long.

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