Coelotilapia joka is a vulnerable species of cichlid fish from rivers in Sierra Leone and Liberia in West Africa. This relatively small tilapia formerly was included in the genus Tilapia, but in 2013 it was moved to its own genus Coelotilapia and tribe Coelotilapini.
It is an oval shaped fish with a black body coloring. Eight to nine yellow, transverse stripes mark the body. The head has small, irregular yellow lines that extend from the eye to the snout, forehead, and mouth. It is one of the few tilapia species that regularly are kept in aquariums.
Coelotilapia joka can reach up to about 10 cm (4 in) in total length. It originates from West Africa; found near the banks of clear rivers and tributaries of the lower parts of the Moa and Moro Rivers, southern Sierra Leone and northern Liberia and lives from the middle to the bottom of the river. Males have an elongated anal and dorsal fins and, with age, have white tips on their fins. In the wild, its diet is mainly herbivorous with some live foods taken.
Pairs form monogamous bonds and later patriarch/matriarch families.
