Yellow lab

Water parameters

Tolerated range for this species. Aim for the middle of each band rather than the extremes.

Tank and habitat

Substrate: sand.

Behavior

Plant interaction: destroys most plants.

Feeding

Omnivore with a strong herbivorous leaning. In Lake Malawi, wild populations pick invertebrates from rock surfaces but also consume a significant amount of aufwuchs (the algae/biofilm mat growing on rocks). In the tank, feed a Mbuna-appropriate diet: spirulina-based flake or pellets as the staple, supplemented with blanched vegetables (peas, zucchini, spinach) and occasional frozen food (brine shrimp, mysis). Avoid high-protein food as a daily staple. Bloodworm in particular is associated with Malawi bloat in Mbuna, though the causal link is debated. The conservative advice is to limit bloodworm to once a week at most and never as a staple. They're greedy feeders that will outcompete slower tankmates. Feed two to three times daily in small amounts rather than one large feeding.

Compatibility

• One of the least aggressive Mbuna cichlids, which is a relative statement. In a mixed Mbuna tank, yellow labs are usually the peacekeeper species. In a standard community tank with tetras and rasboras, they're the bully.
• Best kept in a species tank or with other Mbuna of similar size and temperament. Classic pairings: rusty cichlid (Iodotropheus sprengerae), yellow-tail acei (Pseudotropheus acei), and other relatively mild Lake Malawi species. Avoid housing with hyper-aggressive Mbuna like Melanochromis auratus or M. chipokae.
• The standard Mbuna stocking ratio applies: overstock moderately to spread aggression. One male to 3-4 females is the minimum. A tank of all males or a 1:1 ratio produces constant harassment of subdominant individuals. Groups of 8-12 in a 200 L tank is the target.
• Hybridizes freely with other Labidochromis species in the tank. If you keep multiple Labidochromis species (L. caeruleus, L. chisumulae, L. sp. "Hongi"), expect cross-breeding and mixed offspring that are difficult to identify or sell.

Origin and habitat

Endemic to Lake Malawi. The species as a whole is distributed on the west coast between Ruarwe and Nkhata Bays and on the east coast from southern Tanzania to northern Mozambique, but the bright electric yellow morph (the "yellow lab" of the hobby) is found only in a restricted area on the western side in Nkhata Bay, between the islands of Charo and Lion's Cove. About a dozen naturally occurring color morphs exist, including white, blue, and pale yellow varieties. Described by Fryer in 1956; the species name caeruleus means "blue" in Latin, referring to one of the non-yellow forms. Found in two distinct biotopes in the lake: rocky areas and heavily vegetated beds of Vallisneria (NAHF). A maternal mouthbrooder; the female carries eggs and developing fry in her buccal cavity for about three weeks. Large males may reach 15 cm, though the recorded maximum is a smaller 8.1 cm; other sources give 10–15 cm. One of the most popular African cichlids in the aquarium trade due to the striking yellow coloration. The yellow morph breeds true in captivity and is commercially produced in massive numbers worldwide. Part of the genus Labidochromis, which contains 18 formally described species endemic to Lake Malawi. IUCN Least Concern.

Breeding

Maternal mouthbrooder, like all Mbuna. The male displays on a flat rock or pit in the sand, attracting the female with lateral displays and quivering. After the female deposits a few eggs on the substrate, she immediately picks them up in her mouth. The male's anal fin has egg-shaped spots ("egg dummies") that the female mouths, stimulating the male to release sperm which she takes in to fertilize the eggs. The cycle repeats until 10-30 eggs are being incubated. The female holds the brood for 18-21 days, during which she doesn't eat. Fry are released at about 10 mm and are immediately self-sufficient. They're large enough to eat crushed flake from day one. In a community Mbuna tank, some fry survive by hiding in rock crevices, but predation from other fish (including the father) is heavy. For maximum survival, strip the female at 14-18 days and raise fry separately, or let her spit naturally into a breeder box. Yellow labs breed readily in captivity with no special conditioning required. A healthy group in a well-maintained tank produces a new brood every 4-6 weeks.

Common problems

Malawi bloat is the signature disease concern for all Mbuna, including yellow labs. Symptoms: swollen abdomen, loss of appetite, white stringy feces, rapid breathing. Caused by a combination of improper diet (too much protein, not enough vegetable matter) and stress. Bloat can progress to organ failure quickly if untreated. Metronidazole is the standard treatment, dosed in food or directly to the water. Prevention is better: keep the diet herbivore-weighted and maintain low stress by overstocking appropriately. Aggression within the group is normal Mbuna behavior but can become pathological if the tank is too small or the male-to-female ratio is wrong. A single dominant male harassing one female endlessly will kill her through stress. The solution is more females per male and enough rock structure to break sightlines. Yellow labs crossed with other Labidochromis species produce hybrid offspring that look like neither parent and are nearly impossible to sell or trade. If keeping multiple Labidochromis species, use barrier methods or accept the hybridization.

Bioload

Further reading

• Stocking ideas by tank size