Squalius aradensis is a ray-finned fish species in the family Cyprinidae, growing to 13 cm (5.1 in) SL. It is endemic to Portugal where it is found in only three river basins: Arade, Algibre, and Bordeira basins. It is threatened by water extraction, drought, and introduction of exotic fish species.Squalius aradensis is an ubiquitous species which inhabits small to medium-sized streams with Mediterranean water regime. It may be restricted to very small pools during summer.