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Mylochromis melanonotus

Haplochromis Yellow-black Line

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Last revised 2026Edit this page

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Quick factsEdit

Max size
260mm SL10in SL
Aquarium size
150 × 60cm60 × 24in
Temp
24–28°C75–82°F
pH
7.6–8.8
Hardness
10–25dGH

Difficulty5 of 8 measures

Moderate

How the rating is worked out

Space
very large tank
Water
flexible
Temp
needs a steady temperature
Diet
unknown
Temperament
eats smaller fish
Social
one male with several females
Compatibility
unknown

Other demands

Each of these can raise the rating on its own, whatever the measures above say.

Hardiness
unknown
  • Needs a very large tank

Before you buy

  • Needs a soft, sandy substrate

    A sandy substrate is essential, as the fish will often take mouthfuls of sand into their mouths, sifting it for food items.

Known in the trade as 'Haplochromis yellow-black line', Mylochromis melanonotus is a predatory cichlid endemic to Lake Malawi. Rarely imported, it caused confusion because some individuals have a shovel-like lower jaw. Ad Konings found wild populations with and without it, and Platygnathochromis and M. semipalatus are now regarded as synonyms. A sandy substrate is essential, and it will eat small fish.

Distribution

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Endemic to Lake Malawi. It has a wide distribution in the lake.

It usually inhabits areas with sandy substrates in deeper water but is also often found around the intermediate shoreline areas, where there are scattered rocks over sandy bottoms.

Aquarium size

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Standard length
260mm SL10in SL
Aquarium base
150 × 60cm60 × 24in
Volume
~540litres~143US gal

150 ∗ 60 ∗ 60 cm60 ∗ 24 ∗ 24 in - ~540 litres~143 US gal for adult specimens. Juveniles can be kept in smaller aquaria.

Maintenance

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Arrange piles of rocks to form caves and hiding places, with areas of open space between for swimming. A sandy substrate is essential, as the fish will often take mouthfuls of sand into their mouths, sifting it for food items. If gravel is used the mouthparts or gills may be damaged or a piece may get stuck in the throat of the fish.

Water conditions

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Temperature
24–28°C75–82°F
pH
7.6–8.8
Hardness
10–25dGH

Temperature: 24 – 28 °C75 – 82 °F

pH: 7.6-8.8

Hardness: 10-25°H

These recommendations come from this profile’s own figures. They contain affiliate links, so we may earn a commission.

Offer a varied diet of meaty live and frozen foods and good quality cichlid pellets.

Behaviour and compatibility

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It is piscivorous and will eat small fish. It is not particularly aggressive with anything too large to fit in its mouth, but the choices are fairly limited. Tankmates could include Aristochomis, Fossorochromis rostratus or Rift Lake Synodontis species. It should not be kept with mbuna. Male fish should be kept along with several females but are territorial with other males, so we suggest only one male per aquarium.

Sexual dimorphism

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Males are more colourful than females.

Reproduction

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Not known to have occured in aquaria. It is a maternal mouthbrooder and in nature, breeding occurs in a similar fashion to others of the genus, with the males excavating large pits which they defend against other males. Spawning occurs in these pits after which the female leaves the male's territory.

Notes

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M. melanonotus is rarely imported and little information is available regarding its captive care. The shovel-like lower jaw possessed by some individuals of this species has been the cause of some confusion regarding the fishes' true identity. It was originally placed in the genus Platygnathochromis, in which it was the only species. However, Ad Konings observed that amongst wild breeding populations there existed individuals both with and without the modified lower jaw. The specimens without the modification were identical to another species, Mylochromis semipalatus. Therefore all these fish are now classified as Mylochromis melanonotus, with Platygnathochromis and semipalatus being regarded as synonyms of this species.

Distribution

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