Tanganyika clown

The Tanganyika clown, Eretmodus cyanostictus, is a small freshwater fish in the family Cichlidae, also known as the striped goby cichlid. It lives along the shorelines of Lake Tanganyika; Wikipedia places it on the Tanzanian and Zambian shores, and FishBase describes it as endemic to the southern part of the lake, from Kipili in Tanzania to Moliro in the Democratic Republic of the Congo. Males and unsexed fish reach about 9 centimetres in total length. FishBase diagnoses the species by a terminal mouth and a number of bright blue spots on the head and upper half of the body, with about five light bars on the lower flank. It occurs in rocky areas, in the turbulent and highly oxygenated shallows of the surf zone, where it scrapes algae from the rocks. Both parents brood the eggs and larvae in the mouth. The IUCN Red List assessed it as Least Concern in 2025, and it is traded commercially for aquariums.