Got a photo? Identify fish instantly with the Fishby app.
Open the appDescription
Melanochromis johannii is a small, elongated cichlid endemic to Lake Malawi, Africa. It is renowned for its striking sexual dimorphism, with males displaying brilliant electric blue coloration with dark horizontal stripes, and females exhibiting a vibrant orange-yellow hue. This species is a popular aquarium fish due to its vivid colors and active nature, though its aggressive tendencies require careful consideration in community tanks.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Males are brilliant electric blue with two prominent dark horizontal stripes running along the body. The dorsal fin often has a light blue or white margin. Females and juveniles are bright orange-yellow, sometimes with faint darker markings. Some regional variations exist, with males showing more black or less intense blue.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Pronounced sexual dimorphism in coloration, Elongated body typical of Melanochromis species, Males possess egg spots on the anal fin, though less prominent than in some other cichlids
- Dorsal fin
- Long, extending almost the entire length of the back, with spiny rays anteriorly and soft rays posteriorly.
- Tail fin
- Slightly rounded to truncate.
- Pectoral fin
- Relatively small and clear.
- Distinctive fins
- Pelvic fins are often elongated in males, sometimes with a dark leading edge.
Identification Tips
Male Coloration
Look for the striking electric blue body with two distinct dark horizontal stripes. This is the most definitive feature for adult males.
Female/Juvenile Coloration
Identify by the vibrant orange-yellow body. This contrasts sharply with the male's blue and is a key identifier for females and young fish.
Body Shape
Observe the elongated, torpedo-like body shape characteristic of the Melanochromis genus, which helps distinguish it from more robust or compressed cichlids.
Habitat in Wild
In its natural habitat, it will be found in rocky areas, often darting between crevices.
Habitat
- Water type
- freshwater
- Depth
- Typically found in rocky areas at depths of 3-10 meters (10-33 feet), though can be found shallower or deeper.
- Environment
- Rocky littoral zones of Lake Malawi, characterized by abundant rock formations, crevices, and caves. These provide shelter, foraging grounds, and breeding sites.
- Geographic range
- Endemic to Lake Malawi, Africa. Specifically found along the eastern coast, from Masinje to Cape Ngombo, and around Likoma Island.
Aquarium Information
- Care level: intermediate
- Temperament: aggressive
- Diet: herbivore
- Minimum tank size: 55 gallons (208 liters)
- Temperature: 76-82°F (24-28°C)
- pH level: 7.8-8.6
- Hardness: 10-20 dGH
- Compatibility: Best kept in a species-specific tank or with other robust, similarly sized and tempered Lake Malawi cichlids. Avoid keeping with peaceful or much smaller fish. One male with multiple females is recommended to diffuse aggression.
- Special requirements: Requires a rocky aquascape with numerous caves and hiding places to establish territories and reduce aggression. A sandy substrate is preferred. Excellent filtration and regular water changes are crucial to maintain water quality.
Wild Information
- Conservation status: least concern
- Seasonality: Breeds year-round in suitable conditions, with peak activity often influenced by food availability and water parameters.
- Market price: Varies, typically $5-$20 per fish depending on size and coloration.
- Commercial importance: medium
- Taste: Not typically consumed due to small size and value as an ornamental fish.
- Texture: Not typically consumed due to small size and value as an ornamental fish.
- Nutritional value: Not typically consumed due to small size and value as an ornamental fish.
Key Facts
Striking Dimorphismamazing
The Electric Blue Johanni is famous for its dramatic sexual dimorphism, where males are electric blue and females are bright orange-yellow, making them easily distinguishable.
Mbuna Groupinteresting
It belongs to the 'Mbuna' group of cichlids, a term meaning 'rock-dwelling' in the local Tonga language, reflecting their habitat preference in Lake Malawi.
Territorial Naturebehavior
Despite their relatively small size, Electric Blue Johannii are highly territorial and aggressive, especially the males, which can be challenging for aquarists.
Mouthbroodersbehavior
Like many Lake Malawi cichlids, M. johannii are maternal mouthbrooders, with the female carrying and protecting the eggs and fry in her mouth.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: not recommended
- Handling notes: While not venomous, these fish can deliver a painful bite if handled carelessly due to their sharp teeth and aggressive nature. Use a net for transfer and avoid direct contact with hands. Their territorial aggression can also lead to stress and injury to other fish in an aquarium if not properly managed.
Similar Species
Maingano Cichlid
Melanochromis cyaneorhabdos
Males of M. cyaneorhabdos have a similar blue body with dark stripes, but the stripes are typically thicker and more pronounced, and the blue is often a deeper, darker shade. Females of M. cyaneorhabdos are also blue with dark stripes, unlike the orange-yellow females of M. johannii. M. cyaneorhabdos also tends to be slightly smaller.
Auratus Cichlid
Melanochromis auratus
M. auratus exhibits reversed sexual dimorphism compared to M. johannii. Males are dark (black/brown) with light (yellow/blue) stripes, while females are bright yellow with dark stripes. This is a clear distinction from M. johannii where males are blue and females are orange-yellow.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Cichliformes
- Family
- Cichlidae
- Genus
- Melanochromis
- Species
- johannii
Explore Electric Blue Johanni
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.