Axolotl Life Cycle: Egg, Larva, Juvenile and Adult
The axolotl life cycle has four stages: egg, larva, juvenile and adult. Eggs hatch in about 10 to 14 days. Axolotls reach sexual maturity at about one year, according to the Animal Diversity Web. Unlike most salamanders, they stay in the water and keep their gills for life. Lifespan is 5 to 6 years in labs, and often 10 to 12 years in good care.
Most salamanders start in water and then move onto land. Axolotls do not. They go through every stage of life as aquatic animals with external gills.
This guide walks through each stage, with timing and size from vet and university sources. Where sources disagree, both figures are shown.
How this was made: prepared with AI assistance and checked against the sources listed at the end. Images are AI-generated illustrations, not photographs of real animals or products.
Key Takeaways
- The four stages are egg, larva, juvenile and adult.
- Eggs hatch in about 10 to 14 days (ADW).
- Axolotls reach sexual maturity at about one year, though one source says it can be as early as six months.
- Adults average 25 to 30 cm, per the Royal Veterinary College (RVC).
- Lifespan ranges from 5 to 6 years in labs to 10 to 12 years or more with good care.
- Metamorphosis into a land form almost never happens.
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Stage 1: egg
The cycle starts with a single egg about 2 mm across, wrapped in jelly (RVC). In the wild, females lay eggs from March to June, once a year, according to the Animal Diversity Web (ADW). The AGSC at the University of Kentucky says axolotls in captivity can breed more than once a year.
Eggs are laid one at a time on plants or rocks. ADW reports 100 to 300 eggs per spawn, while Caudata.org, a hobbyist reference, reports 100 to over 1,000. Hatching takes 10 to 14 days (ADW), or about 14 days at 24°C (Caudata.org).
For more detail, read our full guide to axolotl eggs.
Stage 2: larva
Hatchlings are independent at once, and ADW says there is no parental care. They are tiny larvae with feathery external gills.
The University of Kentucky Ambystoma Genetic Stock Center (AGSC) says feeding begins when larvae come to the surface to gulp air. They then eat newly hatched brine shrimp. At about 3 cm they move to larger foods such as California blackworms.
The AGSC also reports that larvae kept in groups often get bite injuries to the limbs and tails, and that these usually heal by regeneration.
Stage 3: juvenile
Juveniles look like small adults. They grow quickly and eat more. The AGSC uses 4 mm pellets for animals 4 to 8 cm long and 5 mm pellets for larger ones.
RVC says juveniles can eat whiteworms and grindal worms, but these are fatty and should not become a permanent diet.
Growth speed depends on food and temperature. Caudata.org reports that well-fed larvae kept at 24°C can reach 25 cm and sexual maturity in under 6 months. That is a hobbyist figure for warm water. RVC recommends 16-18°C and says water should never exceed 24°C.
| Stage | Key facts | Source |
|---|---|---|
| Egg | About 2 mm. Hatches in 10 to 14 days. | RVC, ADW |
| Larva | Feeds on brine shrimp, then blackworms from about 3 cm. | AGSC |
| Juvenile | Grows fast. Eats worms and pellets. | AGSC, RVC |
| Adult | 25 to 30 cm on average. Matures at about 1 year. | RVC, ADW |
| Old age | 5 to 6 years in labs. 10 to 12 years with good care. | ADW, RVC |
Stage 4: adult
ADW says axolotls average about 20 cm and can exceed 30 cm. They reach sexual maturity at about one year. RVC says adult size comes at 18 to 24 months, averaging 25 to 30 cm and up to 35 cm. Caudata.org states maturity usually occurs at about 20 cm, anywhere from 6 months to over a year.
The ranges overlap, and growth varies by animal and conditions. For size details, see our guide to how big axolotls get.
How long do axolotls live?
ADW gives an expected lab lifespan of 5 to 6 years and says some animals reach 10 to 15 years. RVC says axolotls commonly live 10 to 12 years and have been known to live past 20.
These figures differ because lab and pet conditions differ. A full breakdown is in our post on axolotl lifespan.
Does the life cycle include metamorphosis?
Usually not. Axolotls are paedomorphic, which means they keep larval features such as external gills and finned tails as adults. Britannica says they rarely, if ever, metamorphose in nature.
Thyroid hormone can trigger metamorphosis in the lab, and ADW says most lab animals die shortly afterward. Read more in our guide to axolotl transformation.
Frequently Asked Questions
How many stages are in the axolotl life cycle?
Four: egg, larva, juvenile and adult. Metamorphosis is a rare fifth step.
How long do axolotl eggs take to hatch?
About 10 to 14 days (ADW).
How old are axolotls when they mature?
About one year per ADW. Caudata.org says anywhere from 6 months to over a year.
How big do adult axolotls get?
RVC says 25 to 30 cm on average and up to 35 cm. ADW says about 20 cm on average, over 30 cm in some.
How long do axolotls live?
5 to 6 years in labs (ADW) and commonly 10 to 12 years with good care (RVC).
Do axolotls ever leave the water?
Not normally. They are aquatic for life unless thyroid hormone triggers metamorphosis.
Bottom Line
The axolotl life cycle is simple: egg, larva, juvenile and adult, all in water. Timing depends on temperature, food and the animal itself.
Use the ranges here as guides, not promises. If your axolotl seems unwell at any stage, see an exotics vet.
Sources
- Animal Diversity Web: Ambystoma mexicanum (University of Michigan), accessed 31 October 2026
- Royal Veterinary College: Axolotl care and advice, accessed 31 October 2026
- University of Kentucky Ambystoma Genetic Stock Center: AGSC Guide 2024, accessed 31 October 2026
- Caudata.org: Ambystoma mexicanum species page, accessed 31 October 2026
- Britannica: Axolotl, accessed 31 October 2026
- CDC: Reptiles and amphibians, accessed 31 October 2026
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