黄桨鳍丽鱼

Overview

Mchenga flavimanus is a generally peaceful, shoaling Malawi cichlid adapted to feeding on zooplankton in open water. Swimming room and calm companions are priorities; an aggressive mbuna arrangement is inappropriate.

Distribution & habitat

Endemic to Lake Malawi, it is recorded from Nkhata Bay and around Chitande, Mbowe and Kande islands. Sandy areas or isolated boulders at roughly 5–20 meters depth are typical. Large shoals occupy the open water, sometimes alongside other species.

Aquarium setup

Use at least approximately 120 × 45 × 45 cm and preserve extensive swimming space. Sand and limited rock piles provide shelter, variation and possible spawning sites. The fish does not damage plants, so a few hard-water-tolerant species may be used without crowding the swimming area.

Diet & feeding

A zooplankton specialist in nature, it is usually flexible in captivity. Combine small live, frozen and dry foods, with brine-shrimp nauplii particularly useful. Include some plant material, such as blanched spinach or spirulina flakes.

Behaviour & compatibility

Avoid rowdy mbuna and be cautious with similarly colored fish that may provoke aggression. Other Mchenga or Copadichromis should not be combined with it because of hybridization risk. Gentle Malawi peacocks and other peaceful open-water cichlids are better candidates.

One male with at least three females is practical in most tanks, spreading courtship pressure. Multiple males need substantially more space and a correspondingly larger female group so each male can maintain his own area.

Sexual dimorphism

Males are larger, much more colorful and longer-finned.

Breeding

Females mouthbrood. A dedicated aquarium around 120 cm long can house one male and at least three females with flat stones. Approximately pH 8.2–8.5 and 25–26.5 °C are breeding references. A displaying male courts at a chosen site and may pursue females strongly. The female lays, immediately collects the eggs and then receives sperm while responding to his anal-fin egg spots.

Brooding may exceed three weeks. The female normally does not eat and develops a distended mouth. Stress or relocation can cause premature release or consumption of the clutch, while a prolonged absence may affect her position in the group. Avoid unnecessary movement unless she is being harassed. Naturally released fry can take brine-shrimp nauplii.

Notes

Older accounts may place the fish in Copadichromis rather than Mchenga. These fishes belong to the open-water Malawi assemblage commonly called utaka and can rapidly protrude the mouth to suck in drifting prey. Exact spawning locations vary among related species and should not be assumed identical.