 The remaining are five mouthbrooding species of "Oreochromis"; four chambo in the subgenus "Nyasalapia" ("O. karongae", "O. lidole", "O. saka" and "O. squamipinnis") that are endemic to the Lake Malawi system, as well as the closely related "O. shiranus", which also is found in Lake Chilwa.The Malawi "Oreochromis" mainly feed on phytoplankton, reach lengths up to depending on the exact species, and are mostly black or silvery-gray with relatively indistinct dark bars.Male chambo have unique genital tassels when breeding, which aid in egg fertilisation in a manner comparable to the egg-spots on the anal fin of haplochromines.