Are Axolotls Fish? (No, And Here's Why That Matters)

The short answer: no, axolotls are not fish. They’re amphibians, specifically salamanders. And yes, that distinction matters a lot for how you keep them.

What Axolotls Actually Are

Axolotls (Ambystoma mexicanum) are aquatic salamanders native to Lake Xochimilco in Mexico. The scientific category is:

• Kingdom: Animalia
• Class: Amphibia (not Pisces)
• Order: Urodela (salamanders)
• Family: Ambystomatidae (mole salamanders)
• Species: Ambystoma mexicanum

Most salamanders start life with gills in water, then metamorphose to lungs and live on land. Axolotls do something unusual: they keep their gills and stay in the water for their entire 10-15 year lifespan. This is called neoteny. They’re essentially permanent baby salamanders.

Why People Get Confused

Three reasons axolotls keep getting mislabeled as fish:

1. They live entirely underwater. Almost every other amphibian leaves the water as an adult.
2. They have visible gills. Those feathery pink things on the sides of their head look like (and function as) fish gills.
3. Pet stores often sell them next to fish. Big-box pet stores stock axolotls in aquarium aisles, leading people to assume they’re fish.

But the differences run deep.

What Makes Axolotls Not Fish

Skeleton. Axolotls have four legs with fingers and toes. Fish have fins.

Skin. Axolotls have moist, permeable amphibian skin that absorbs water and oxygen. Fish have scales.

Breathing. Axolotls have lungs AND gills AND can breathe through their skin. They surface for air occasionally. Fish breathe only through gills.

Reproduction. Female axolotls lay jelly-coated eggs that look like frog eggs. Males deposit spermatophores. Fish lay simple eggs and either spray external sperm or use internal fertilization with claspers.

Cold blood with different metabolism. Axolotls are ectotherms like fish, but their metabolism handles cool water much better than tropical fish.

Why This Matters for Care

The “axolotls are fish” misconception kills axolotls. Specifically:

You can’t keep them with fish. Even friendly community fish will nip at the axolotl’s gills. Larger fish swallow small axolotls. The fish carry parasites that destroy axolotls. There’s no fish/axolotl combo that works long-term.

Their food is different. Most aquarium fish flakes are wrong for axolotls. They need protein-heavy carnivore food (earthworms, sinking pellets formulated for carnivorous amphibians, blackworms). See the full food safety database.

Their water is different. Most tropical fish want 75-82°F. Axolotls want 60-68°F. A “well-meaning” pet store employee who treats axolotls like exotic fish will set you up for failure.

Their tank setup is different. Fish tanks emphasize swimming volume (tall is fine). Axolotl tanks need long footprints because axolotls walk on the bottom.

Their illnesses are different. Ich treatments for fish can be toxic to axolotls. The salt baths fish keepers use need to be carefully dosed for amphibians.

What About “Axolotl Fish” on Amazon?

If you search “axolotl fish” on Amazon you’ll see listings for plush toys, painted models, and the occasional aquarium kit. These products use the term as marketing because that’s how customers search. The product descriptions usually also include “axolotl” or “salamander” correctly. The animals themselves are not fish.

The Closest Animal Comparison

If you want a mental model: axolotls are most similar to tadpoles that never grew up. A tadpole has gills, swims with its tail, and lives underwater. Then it transforms into a frog. An axolotl skips that transformation and stays in tadpole-mode for its entire life, while still developing reproductive organs and reaching adult size.

This is why axolotls are scientifically fascinating. Their cells stay in an “embryonic” state that can regenerate entire limbs, parts of the heart, sections of the spinal cord, and even portions of their brain. Researchers study them specifically to understand regeneration.

Bottom Line

Axolotl: amphibian salamander. Lives in water for life. Not a fish.

If you’re keeping one, treat it like the amphibian it is. Cool water, no tankmates, protein-rich food, real cycling, fine sand or bare bottom, gentle filtration. See our complete tank setup guide for the full walkthrough.