Abactochromis labrosus

Abactochromis labrosus is a monotypic mbuna genus from Lake Malawi notable for its unusually large, fleshy lips — an adaptation for sucking invertebrates from rock crevices rather than grazing algae. This dietary specialisation makes it unique among mbuna: it is primarily insectivorous, extracting small crustaceans, invertebrates, and larvae from the biofilm community on rocks.

This different feeding ecology means Abactochromis accepts meaty foods more readily than typical mbuna, and in fact requires animal protein for optimal health — a complete reversal of the standard mbuna dietary advice. Despite the dietary difference, it is still territorial and aggressive in the manner of other mbuna. Males are blue to blue-grey with prominent thick lips. Females mouthbrood for approximately 21–28 days. This species is rare in the hobby and highly prized by serious Malawi cichlid specialists.