Since I am mostly a cichlid keeper
The Central American cichlids of the genus Tomocichla, Rheoheros, Chuco, and Paraneetroplus
above, Tomocichla asfraci, below Chortoheros wesseli
From Madagascar
the Paretroplines of the Lamena clade, and the genus Oxylapia.
above Paretroplus nourissati
A number of South Americans in the Geophagus genus, and especially including Retroculus
above Geophagus altifrons
There are also many African riverine species, especially from the Congo like Steaticranus, and Telegramma
Even a number of Gobys, barbs and mouth breeding Anabantids that inhabit fast flowing streams (Borneo)