Maingano

Quick facts

Adult size

8 cm

Lifespan

can live up to 8 years

Tank zone

all

Temperament

aggressive

Difficulty

intermediate

Water parameters

Temperature

24–28°C

pH

7.5 to 8.5

Hardness

10 to 25 dGH

Tank requirements

Minimum volume

200 L

Minimum length

100 cm

Flow

moderate

Lighting

any

Substrate

sand

Hiding spots

needed

Open swimming room

needed

Feeding

Diet: omnivore, feeds primarily at the all.

Omnivore with herbivorous emphasis, like all Mbuna. Spirulina-based flake or pellets as the staple, supplemented with blanched vegetables (peas, zucchini, spinach) and occasional frozen food (brine shrimp, mysis). Limit high-protein foods, especially bloodworm, which is associated with Malawi bloat in Mbuna. Feed 2-3 small meals daily rather than one large feeding to reduce aggression at feeding time. They're fast, competitive eaters that outcompete slower tankmates.

Vegetable matter required (algae wafers, blanched zucchini, spinach).

Compatibility

• Aggressive Mbuna cichlid, more assertive than many similarly sized species. Males are territorial and chase conspecifics and similar-looking fish relentlessly.
• Keep in groups with a ratio of one male to 3-4 females. All-male tanks are not recommended for this species; males fight each other intensely. In a mixed Mbuna tank, mainganos hold their own but shouldn't be paired with the most aggressive species (Melanochromis auratus, M. chipokae).
• The deep blue-purple body with lighter horizontal stripes makes them visually similar to several other Melanochromis species. Avoid keeping with M. cyaneorhabdos (also called maingano by some sources) or M. johanni, as they hybridize and fight.
• Standard Mbuna tank setup: overstocked moderately to spread aggression, abundant rock piles for territory boundaries and hiding spots, minimum 200 L for a group.

Habitat

Endemic to Lake Malawi, East Africa. Found in the rocky littoral zone around Likoma Island, an island in the Mozambican portion of the lake. The species (Melanochromis cyaneorhabdos) was described by Bowers and Stauffer in 1997. The body is deep blue to purple-blue with two lighter horizontal stripes running from behind the eye to the caudal peduncle. Males and females are similar in color, which is unusual for Mbuna and makes sexing difficult without venting. Adult size is about 8–10 cm. The species became popular in the hobby because of the intense blue coloration that's visible even in juvenile fish, unlike many Mbuna that only show full color as adults. There is persistent confusion in the hobby about the correct identification: fish sold as 'maingano' may be M. cyaneorhabdos, M. johanni, or hybrids between the two. The name 'maingano' comes from a collection locality and has been applied inconsistently. Commercially bred in large numbers.

Breeding

Maternal mouthbrooder, following the standard Mbuna pattern. The male displays on a territory (usually a flat rock or pit in the sand) and attracts females with lateral displays and quivering. Spawning follows the egg-dummy method: the female deposits a few eggs, picks them up in her mouth, then mouths the egg-spot markings on the male's anal fin, stimulating sperm release that she takes in to fertilize the eggs. The cycle repeats until 10-25 eggs are being carried. The female holds the brood for 18-21 days without eating. Fry are released fully formed at about 8–10 mm and eat crushed flake and baby brine shrimp. In a community Mbuna tank, some fry survive by hiding in rock crevices. For maximum yield, strip the female at 14-18 days or isolate her in a separate tank to release fry. Breeding is constant in healthy groups; a new brood appears every 4-6 weeks.

Common problems

Malawi bloat is the main health concern for all Mbuna, including mainganos. The symptoms (swollen abdomen, white stringy feces, loss of appetite, rapid breathing) progress to organ failure if untreated. Metronidazole is the standard treatment. Prevention: keep the diet herbivore-heavy, maintain water quality, and avoid chronic stress from inadequate stocking or bad male-to-female ratios. Hybridization with other Melanochromis species is a persistent issue in mixed tanks. The resulting offspring are genetic mixes that contaminate breeding lines and are difficult to sell. If keeping multiple Melanochromis species, accept hybridization or separate them. Aggression between males is more intense than in milder Mbuna like yellow labs; injuries (torn fins, lip damage from jaw-locking) are common in undersized tanks.

Bioload

Bioload coefficient: 3.0 (small mbuna; moderate waste for its size due to constant grazing).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• Stocking ideas by tank size