Wikipedia
Sciaenochromis
Sciaenochromis is a genus of haplochromine cichlids endemic to Lake Malawi in East Africa. The species are popular in the aquarium hobby, most notably S. fryeri.
Only males possess the impressive, electric blue coloration, while females are dull grey, and generally similar to the females of Aulonocara species. All Sciaenochromis are piscivores (fish-eaters) and prey mainly upon the fry of mbuna and other haplochromine cichlids.