Pink Leucistic Axolotl (Ambystoma mexicanum)

Meet the pink leucistic axolotl

The Pink Leucistic Axolotl is the classic pale form of the axolotl, Ambystoma mexicanum, a salamander in the family Ambystomatidae that keeps its larval shape for life. A leucistic axolotl has pinkish-white skin, three pairs of feathery external gills that look pink to red because blood shows through them, a translucent tail fin and dark eyes. It is a cold-water amphibian that needs cool, clean water and no heater, which makes its care very different from that of the tropical fish and frogs most aquarium keepers know.

Axolotls are sometimes called Mexican walking fish, but they are not fish. They normally never complete the change into a land-living salamander: Practical Fishkeeping explains that they do not produce the thyroxine that would trigger it, and that injecting the hormone can force a change into an animal resembling a tiger salamander. That is not something any keeper should attempt. Instead, axolotls grow, breed and live their whole lives underwater with gills, a tail fin and four short legs.

Tell leucistic from albino and wild-type axolotls

The leucistic colour comes from the recessive "white" gene. In a 2017 study in Scientific Reports, Woodcock and colleagues traced it to the gene for endothelin 3, which pigment cells need in order to develop and spread through the skin. White axolotls are typically almost free of skin pigment cells, although some adults develop patches of dark pigment cells, which is why freckles can appear on the head and back as a leucistic axolotl grows. A single white axolotl was among the animals a French expedition collected at Xochimilco, Mexico, in 1863, the founders of the laboratory axolotl population. Albino axolotls carry a different gene, tyrosinase, and the same study found that this albino gene entered the laboratory stock from tiger salamander DNA.

Compare our Golden Albino Axolotl and Wild Type Green Axolotl, try the Mixed Colour Axolotl if you are happy with any colour, or see all our axolotls together. All colour forms are the same species with the same care.

Choose the 6–8 cm or 9–10 cm size

• One live axolotl per purchase, in the size you select: 6–8 cm or 9–10 cm. Both are juveniles of the same colour form and grow to the same adult size.
• Sex is not selected. Yandulskaya and Monaghan (2023) give about 12 months as the age of sexual maturity, and OATA notes that females become fuller-bodied than males, so the sexes cannot be judged reliably at these sizes.
• Colour and freckling vary between animals and can change as they grow. The photographs show the colour form, not the individual axolotl you will receive.
• Captive bred. OATA notes that all axolotls in the trade are captive bred, because the species is critically endangered in the wild.

The size you select is the size supplied, not the adult size. Practical Fishkeeping says most axolotls top out at around 25 cm, with rare individuals much larger, and OATA gives up to 30 cm. Plan the aquarium for a 25–30 cm adult from the start.

Decide between one axolotl and a group

Axolotls do not need company. OATA says they can be kept singly or in groups, and Practical Fishkeeping notes that they are usually kept alone because animals kept together may bite each other's gills and feet. If you want more than one, buy them at the same size, provide extra floor space and a hiding place for each, and keep them well fed: juveniles can be cannibalistic, and research colonies raise young axolotls apart because the largest nip the limbs and tails of smaller siblings. Never put a 6–8 cm juvenile in with a larger axolotl.

Check our delivery information before ordering, and have the cooled, cycled aquarium ready and tested before the axolotl arrives.

Keep it cool without a heater

Temperature is the most important part of axolotl care. Practical Fishkeeping gives 16–18°C as ideal, and a 2023 research husbandry chapter by Yandulskaya and Monaghan agrees, adding that water held constantly above 18°C raises the risk of body-cavity swelling and that room air should stay below 24°C. OATA's broader group guidance for axolotls is 10–22°C. A healthy axolotl copes with a few warm days above 20°C, but Practical Fishkeeping warns that prolonged heat is stressful and shortens their lives.

No heater is needed. Choose a cool room, keep the tank away from radiators, sunny windows and conservatories, and keep a thermometer in the water so you see a rise before the axolotl suffers from it.

Plan for a UK heatwave

1. Switch the aquarium lights off and close the curtains on hot, sunny days.
2. Increase aeration and run a fan across the water surface.
3. Float sealed bottles or containers of ice, replacing them as they melt.
4. Add small volumes of cool, conditioned water: Practical Fishkeeping suggests that changing roughly 10–15% a day lowers the temperature by a couple of degrees.
5. If your room regularly stays above 20°C for weeks, budget for an aquarium chiller, the one option that holds a set temperature on its own.

Size the tank for a 25–30 cm adult

OATA recommends at least 100 litres for a small group of axolotls, and Practical Fishkeeping gives 90 litres as the minimum for a single adult, with a footprint of about 100 × 45 cm. Depth matters less than floor space, because axolotls walk and rest on the bottom. Longer and wider is always better, and a bigger volume also holds its temperature more steadily in summer. Our tank volume calculator turns your tank's dimensions into litres.

Use a three-step space check

1. Measure the floor: aim for about 100 × 45 cm or more for one adult.
2. Count the animals: add floor space for every extra axolotl, plus a hide for each one.
3. Plan for the adult: use 25–30 cm in your plan, whichever size you select today.

Fit a secure lid. OATA advises a cover for all aquarium amphibians to stop escapes, and Practical Fishkeeping suggests a glass lid kept firmly in place.

Use a bare floor or fine sand

Axolotls feed by sucking food in with a sudden gulp, and small stones can go in with it. Practical Fishkeeping advises against gravel because swallowed pieces can block the gut, although it notes that how often this kills axolotls is not well recorded. OATA recommends either a bare floor or a base of sand, to protect the delicate skin and gills. Fine, smooth, lime-free sand a few millimetres deep, or no substrate at all, are the safe choices.

Furnish for shade and rest

Avoid anything with sharp edges: axolotl skin and gills damage easily. OATA recommends keeping amphibian tanks out of direct sunlight and away from loud noise and vibration, with relatively dim lighting so the animals are not stressed.

Match the water chemistry

Axolotls like neutral to slightly alkaline, moderately hard water. Practical Fishkeeping says very soft water is unsuitable; in soft-water areas it suggests adding salts such as Holtfreter's solution or a Central American cichlid salt mix to raise the mineral content.

UK tap water ranges from very soft to very hard, so test yours before you buy. Our water matcher compares your readings with these ranges, and our water chemistry guide explains each value. Always treat tap water with a conditioner that removes chlorine and chloramine, because chloramine does not gas off from water left to stand.

Separate habitat values from waste readings

OATA warns that axolotls can be stressed by even small amounts of ammonia and nitrite, and that poor water is a common route to disease. Test every week, and immediately if the axolotl's behaviour or gills change.

Filter gently and keep a weekly routine

Axolotls prefer still water. Practical Fishkeeping recommends a filter that can handle the waste of a large, messy carnivore without producing a strong outflow; an internal filter with adjustable flow or a large air-driven sponge filter both work. Mature the filter before the axolotl arrives; our nitrogen cycle guide explains how to build up the bacteria that process waste.

Follow a weekly maintenance sequence

1. Test ammonia, nitrite, nitrate, pH, hardness and temperature.
2. Change about 25% of the water at least once a week, as OATA recommends, using conditioned water at the same temperature.
3. Siphon droppings and leftover food from the floor.
4. Rinse filter media only in the old tank water, never under the tap, so the filter bacteria survive.
5. Check the gills, skin and appetite while you work.

Feed a measured carnivore diet

Axolotls are carnivores. Practical Fishkeeping lists earthworms, bloodworm, fish, seafood and good-quality pellets as suitable foods, and OATA adds larger items such as prawns, mussels and cockles for bigger animals, with specialist prepared pellets for vitamins. Young axolotls of the sizes we sell take small, soft foods such as frozen red mosquito larvae (bloodworm) and small sinking pellets such as Tropical Axolotl Sticks. As they grow, add chopped and later whole live earthworms and frozen mussel meat. Practical Fishkeeping sees no compelling reason to feed red meat.

Sources differ on how often to feed. OATA's general advice for aquatic amphibians is no more than once a day, leaving food for about 15 minutes and then removing leftovers. The research colony described by Yandulskaya and Monaghan feeds adults pellets two or three times a week. We suggest small daily meals while the axolotl is growing, as OATA describes, and fewer, larger meals for an adult, provided it keeps a well-rounded body.

Build one measured meal

• Offer food in front of the head: Practical Fishkeeping suggests moving food with long tongs to catch the axolotl's attention, because it inhales food rather than biting it.
• Size it to the animal: OATA advises feeding items according to the size of the individual, so chop worms and seafood for juveniles.
• Stop when interest fades: remove anything left after about 15 minutes.
• Never overfeed: leftover food breaks down and raises ammonia.

Settle it in and handle it as little as possible

Before arrival, check that the tank is cycled, that ammonia and nitrite are zero and that the water is cool and steady. OATA's floating-bag method works for axolotls: switch the light off, float the unopened bag for about 10 minutes, then add small amounts of tank water to the bag over at least 30 minutes, and release the axolotl with as little bag water as possible.

Practical Fishkeeping advises against handling axolotls, because their skin and gills damage easily and they dislike it. If you must move one, guide it gently into a container rather than lifting it out with your hands.

Use a first-week checkpoint plan

Keep it in a species-only tank

OATA advises keeping axolotls in species-only aquariums. Axolotls will eat any fish small enough to fit in their mouths, and fish too large to be eaten are likely to nip the axolotl's gills. They also need much cooler water than tropical fish and frogs, so there is no sensible compromise temperature.

Screen every proposed companion

Our loaches, oddballs and amphibians collection and aquatic amphibians section group unusual animals with very different needs: browsing them together does not mean they can share a tank.

Watch for stress and illness

Yandulskaya and Monaghan list the signs that an axolotl is unwell: floating at the surface, refusing food, shedding skin, a curled tail, paler and smaller gill branches and paler colouring. OATA adds reddening of the skin, white spots, fluffy growths, ulcers and swelling of the body and limbs. Poor water quality and heat are the commonest causes, so test the water first.

Pair each sign with an action

OATA advises half doses of aquarium treatments for amphibians unless the manufacturer says otherwise, and recommends a vet who specialises in amphibians for anything that good water does not fix. Practical Fishkeeping notes that gill and foot injuries from fights can heal in good conditions. Wash your hands before and after working in the tank, as OATA advises.

Know the legal and conservation points

In the wild, axolotls live only in the remaining canals and lakes of Xochimilco and Chalco on the edge of Mexico City. The San Diego Zoo Wildlife Alliance's summary of the 2019 IUCN assessment lists the species as Critically Endangered, with a decreasing population thought to number only 50–1,000 adults, threatened by polluted and drying canals and by introduced carp and tilapia. Pet axolotls come from captive breeding, not from the wild.

The axolotl is listed on CITES Appendix II and in Annex B of the wildlife trade regulations. GOV.UK guidance says no Article 10 certificate is needed to own or trade Annex B specimens in Great Britain, but the seller must be able to show they were obtained lawfully. Keep your order confirmation: if you ever rehome or sell your axolotl, it is your evidence.

The Animal Welfare Act 2006 gives owners in England and Wales a legal duty of care to meet their animal's needs, and section 11 makes it an offence to sell an animal to anyone believed to be under 16, so orders must be placed by an adult. OATA reminds keepers never to release aquarium animals or plants into the wild: it is illegal and can harm native wildlife.

Check before you order

• A cool room, and a plan for summer heat.
• A tank of at least 90–100 litres with a secure lid.
• A bare floor or fine sand, smooth hides and a gentle filter, fully cycled.
• Test kits, tap-water conditioner and a thermometer.
• No fish or other tank mates, and an adult to place the order.

Understand breeding before you pair axolotls

OATA describes the courtship: the male deposits sperm packets (spermatophores) and encourages the female to pick them up, and she then lays fertilised eggs on plants. The parents eat eggs and young, so eggs must be removed. Practical Fishkeeping notes that breeding usually happens in winter and that clutches can exceed 1,000 eggs. The young need baby brine shrimp and must be graded by size, because cannibalism is common. Only pair axolotls if you can house and rehome the young.

Answer pink leucistic axolotl buying questions

Is a leucistic axolotl the same as an albino axolotl?

No. A leucistic axolotl carries the recessive white gene: its skin is pinkish white but its eyes stay dark. Albino axolotls carry a different gene that removes dark pigment altogether, so they have pale eyes and white or golden skin.

Does an axolotl need a heater?

No. Axolotls are cold-water amphibians. Practical Fishkeeping and a 2023 research husbandry guide both give 16–18°C as ideal, and OATA gives 10–22°C. The challenge in the UK is keeping the water cool enough in summer, not warm enough.

How big does a pink leucistic axolotl grow?

Practical Fishkeeping says most top out at about 25 cm and OATA gives up to 30 cm. The 6–8 cm and 9–10 cm sizes are juveniles, so plan the tank for the adult.

What size tank does an axolotl need?

Practical Fishkeeping gives 90 litres as the minimum for one adult, with a footprint of about 100 × 45 cm, and OATA recommends at least 100 litres for a small group. Floor space matters more than depth.

Can axolotls live with fish?

No. OATA advises species-only aquariums: axolotls eat any fish that fits in their mouth, and larger fish nip their gills. Most tropical fish also need far warmer water.

What do axolotls eat?

They are carnivores. Suitable foods include earthworms, bloodworm, sinking axolotl pellets or sticks, and mussel, cockle or prawn for larger animals. Feed no more than once a day and remove leftovers after about 15 minutes.

Can I keep two axolotls together?

Yes, if they are the same size and have extra space and hiding places. Axolotls do not need company, and young ones of different sizes may bite or even eat each other.

Is it legal to keep an axolotl in the UK?

Yes. Pet axolotls are captive bred. The species is listed on CITES Appendix II and in Annex B of the wildlife trade rules, which needs no Article 10 certificate. In England and Wales animals may not be sold to anyone under 16.

Consult the care references

• OATA: How to care for aquatic frogs & axolotls (Sept 2022) — UK group guidance on temperature, water values, tank size, substrate, feeding, compatibility, introduction and health.
• Practical Fishkeeping: A complete guide to caring for axolotls — ideal temperature, heatwave measures, tank size, substrate, filtration, water hardness, foods, handling and social behaviour.
• Yandulskaya & Monaghan (2023): Establishing a New Research Axolotl Colony, Methods in Molecular Biology 2562 — research-colony temperature, pH, feeding, age at maturity, cannibalism and signs of illness.
• Woodcock et al. (2017): Identification of mutant genes and introgressed tiger salamander DNA in the laboratory axolotl, Scientific Reports 7:6 — genetics of the white (leucistic) and albino forms and the 1863 founders.
• San Diego Zoo Wildlife Alliance Library: Axolotl fact sheet, population and conservation status — IUCN status, wild population estimate, threats and CITES listing.
• Commission Regulation (EU) No 101/2012, wildlife trade annexes — listing of Ambystoma mexicanum in Annex B (CITES Appendix II).
• GOV.UK: Commercial use of endangered species, check if you need an Article 10 CITES certificate — Annex B rules in Great Britain.
• Animal Welfare Act 2006, section 11 — sale of animals to persons under 16 (England and Wales).
• Tropical Fish Co delivery policy — current dispatch and Live Arrival Guarantee terms.