Yellow lab

Quick facts

Adult size

10 cm

Lifespan

can live up to 8 years

Tank zone

all

Temperament

semi-aggressive

Difficulty

beginner

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 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.

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

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.

Habitat

Endemic to Lake Malawi in East Africa. The most commonly collected form is the bright electric yellow morph from Lion's Cove on the northwestern shore. Other geographic variants exist in white, blue, and pale yellow, but the Lion's Cove yellow is what the hobby knows as "yellow lab." Wild populations inhabit the rocky littoral zone, grazing on aufwuchs and picking small invertebrates from crevices in the rocks. In the aquarium, they occupy a 200 L tank with stacked rock formations providing line-of-sight breaks and territory boundaries. The species was described by Fryer in 1956 as Labidochromis caeruleus (the species name means "sky blue," referring to one of the non-yellow forms). The yellow morph became the hobby standard because it's visually striking and breeds true in captivity. Males and females look nearly identical in color, which is unusual for Mbuna; sexing requires venting or waiting for breeding behavior. Commercially bred in massive numbers worldwide, making them inexpensive and almost always in stock.

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

Bioload coefficient: 3.5 (moderate cichlid bioload; less waste per-cm than oscar or convict).

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