Maingano (Melanochromis cyaneorhabdos) Breeding Guide

Breeding Melanochromis cyaneorhabdos: sexing the look-alike sexes, harem setup, a 3-4 week mouthbrooding hold and rearing fry of this endangered Likoma endemic.

Overview

Melanochromis cyaneorhabdos, the Maingano, is endemic to Lake Malawi around Likoma Island, where it lives over rocky substrates at depths of about 5 to 10 metres, and reaches around 10 cm. Listed as Critically Endangered, it is a maternal mouthbrooder whose captive propagation has real value.

Sexing

The species is difficult to sex because both males and females share the dark blue-black body with bright neon-blue horizontal stripes; dominant or sexually active males may simply show more intense colour. Notably, the female colouration differs from the related Melanochromis johannii, whose females are orange, so monomorphism is itself a useful identifying trait. The male carries the egg-shaped spots on the anal fin used during fertilisation.

Conditioning

Condition the group well in stable, hard alkaline water, keeping the pH around 8.2-8.5 and the temperature at about 25-27 degrees Celsius (77-80 degrees Fahrenheit) during the breeding period. In the wild the species lives over rock at depths of about five to ten metres, so a deep, rocky aquascape with secure territories suits it well.

Breeding Setup

An aquarium of around 90 cm (a 36-inch tank) furnished with flat stones and open substrate provides spawning sites. Use a harem of one male and at least three females to spread the male's attention.

Spawning Behavior & Trigger

The male can be quite aggressive in his pursuits during spawning. The female lays her eggs and takes them into her mouth, where they are fertilised via the egg spots on the male's anal fin.

Egg & Fry Care

The female may carry the eggs for up to three to four weeks before releasing the free-swimming fry, not feeding during this time and losing condition as a result. The fry are large enough to take brine shrimp nauplii from birth, and rearing them in a separate grow-out tank protects them from the boisterous adults.

Common Challenges

Because the sexes look alike, assembling a working harem relies on subtle colour intensity and behaviour rather than obvious dimorphism. A stressed holding female may abort her brood, so she should be left undisturbed; given the species' Critically Endangered status, maintaining pure, well-managed breeding stock is especially worthwhile.