What to Actually Feed Your Axolotl — And What Will Slowly Kill It

What do axolotls eat?

In the wild, axolotls (Ambystoma mexicanum) are opportunistic carnivores. Native to the lake complex of Xochimilco in Mexico City, they hunt by detecting water movement and vacuum-sucking prey into their mouths. Their natural diet includes small fish, insect larvae, crustaceans, molluscs, and — most importantly — worms.

This matters because it tells us exactly what captive axolotls are built to eat: soft-bodied, protein-rich, live or freshly dead prey at an appropriate size. The feeding instinct is almost entirely motion-driven. Which is why live food is so important, especially in the early stages of life.

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The best food for axolotls in the UK

The honest answer is live earthworms — specifically Dendrobaena worms (also known as European Nightcrawlers, Eisenia hortensis). By a significant margin, the best primary food source available to UK axolotl owners once your axolotl reaches a decent size. Before that, live moving food is everything.

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Why Dendrobaena worms are the best choice

Dendrobaena worms — the species we raise here in Yorkshire — have become the go-to live food for serious axolotl keepers in the UK for several good reasons.

Nutritional profile

Dendrobaena worms are high in protein (typically 60–70% of dry weight), contain natural fats and amino acids, and have a soft body wall that axolotls can digest easily. Unlike mealworms, there is no indigestible chitin shell. Unlike pellets, the nutrients are bioavailable in their natural form. Rich in calcium for strong bone density, and low enough in fat to help prevent the liver disease that is a common cause of mortality in captive axolotls.

Size suitability

Dendrobaena worms are medium-sized earthworms — typically 5–12cm when extended. For juveniles from around 2.5 inches, they can be chopped into small pieces and introduced gradually. The rule of thumb at every life stage: the food item should be no wider than the space between your axolotl's eyes.

Clean and safe

Farm-raised Dendrobaena worms like ours are grown in controlled conditions, free from pesticides, soil contaminants, and parasites. This is a critical advantage over wild-caught garden worms, which carry a real risk of chemical exposure — particularly in the UK, where garden pesticide use is widespread.

They stay alive and they move

Unlike bloodworms or pellets, live Dendrobaena worms move in the water and trigger the axolotl's natural hunting response. A worm wriggling in front of them is almost impossible to ignore. A static pellet many axolotls will simply walk past.

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How Dendrobaena compare to other worms

Not all worms are created equal. This comes up constantly in the axolotl community, so here is a straight breakdown.

Dendrobaena worms — the best choice

Hardy, actively wriggling, highly nutritious, and — critically — they do not secrete the bitter yellow fluid that causes many axolotls to spit their food back out. Your axolotl snaps, swallows, done.

Lobworms (common earthworms)

Nutritionally excellent, but they run large. You will often have to cut them into pieces, which can cloud your tank water. Fine for big adult axolotls, less practical for anything smaller.

Red wigglers

A perfectly valid staple food from around 3 inches and plenty of axolotls eat them happily. The one thing worth knowing: they can taste bitter to some axolotls. If yours snaps, then spits and seems uninterested, that bitterness is likely the reason. Switch to Dendrobaena and you will almost certainly not have the same problem — they have no bitter secretion at all. But if your axolotl is eating red wigglers without complaint, there is no reason to change.

Blackworms

An excellent staple food for younger axolotls from around 1 inch up to 3 inches. High protein, good movement to trigger the feeding reflex, and the right size for smaller animals. Harder to source in the UK than Dendrobaena, but worth seeking out for this life stage.

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Feeding by life stage

This is where most guides fall short. A hatchling axolotl and an adult axolotl need completely different feeding approaches. Get the early stages right and you set them up for life.

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How much to feed an axolotl

The most common mistake with adult axolotls is overfeeding. The opposite mistake — underfeeding hatchlings and juveniles — is just as damaging. Young axolotls need live food available constantly. Adults are far more forgiving.

For adult axolotls (9 inches+), feed what they can consume in 15–20 minutes and remove anything uneaten immediately. For younger animals, keep live food in the tank around the clock.

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How often to feed an axolotl

Frequency is everything at the younger stages. Hatchlings cannot go without food. Adults are much more resilient. The full breakdown:

A healthy adult axolotl fed every 2–3 days will be more active, have better water quality, and live longer than one fed daily. If you are used to feeding fish, this takes some adjustment. Axolotls are not fish. If there is uneaten food left in the tank after 20 minutes, remove it immediately with a turkey baster or siphon and reduce the portion next time.

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Worms vs pellets: which is better?

This debate comes up constantly in the UK axolotl community. The short answer: worms win, but pellets have a real role.

Before 3 inches, pellets are not appropriate at all. Young axolotls need live moving food. A static pellet does not register as prey. From 3 inches onwards, pellets become a legitimate part of the diet — the rule of thumb is 1–2 pellets per inch of axolotl per feeding.

The problem with cheaper pellets is ingredient quality. Many contain fillers and plant-based proteins that do not align with the axolotl's carnivorous physiology. NT Labs Pro-F Axolotl Pellets are one of the better options on the market — specifically formulated for axolotls rather than adapted from a generic amphibian recipe.

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How to store live worms for axolotls

One of the most common reasons axolotl owners stop using live worms is that they do not know how to keep them alive between feedings. Stored correctly, Dendrobaena worms will last 2–4 weeks — long enough to get through a 50g or 100g pack without waste.

Before you feed: rinse them first

Even farm-raised worms come with bedding on them. Before feeding, rinse a small handful quickly in a cup of dechlorinated tank water. Takes ten seconds and means you are not introducing anything from the bedding into your axolotl's tank.

The Wormi Vermi Worm Keeper Box solves the ventilation and container problem in one. Pair it with our worm chow and your worms will stay alive and healthy for weeks. For a full step-by-step breakdown, read our dedicated worm storage guide.

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Common axolotl feeding problems

My axolotl won't eat

The most common causes are: water temperature above 20°C (this suppresses appetite — check it first), a recent tank move or change causing stress, illness, or the food is not triggering a response. Try wiggling a worm directly in front of their face with tongs. If they have not eaten in two or more weeks and appear lethargic, consult an exotic vet.

My axolotl spits out the worm

Usually means the worm is too large — try a smaller worm or cut it into sections. With cut Dendrobaena, try cutting smaller before giving up entirely. It can also simply mean your axolotl is full. If you are using red wigglers, that bitter secretion is the most likely culprit — switch to Dendrobaena and the problem almost always disappears.

My axolotl ate gravel

A surprisingly common issue. Axolotls will vacuum-suck anything that looks like food. If your tank has a gravel substrate, consider switching to sand or a bare bottom. Gravel ingestion can cause impaction — if your axolotl stops eating and appears bloated, see a vet.

My worms keep dying before I use them

Almost always a storage issue. Check temperature, moisture, and ventilation. See the storage section above. The Worm Keeper Box and worm chow significantly extend worm lifespan.

My axolotl bit my other axolotl's leg

Feed them separately. This is normal feeding reflex behaviour, not aggression. The good news: axolotls have remarkable regenerative ability and will regrow lost limbs in most cases.

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Frequently asked questions

What worms are best for axolotls?

Dendrobaena worms (European Nightcrawlers, Eisenia hortensis, Dendrobaena veneta — same worm, many names) are the best for adult axolotls. High in protein, soft-bodied for easy digestion, the right size, and farm-raised so they carry no pesticide or parasite risk. They do not release the bitter secretion that red wigglers can produce, which means axolotls eat them reliably without spitting. For axolotls under 1.5 inches, live blackworms and baby brine shrimp are the staples.

Can axolotls eat earthworms?

Yes, earthworms are one of the best foods for axolotls from around 2.5 inches. However, wild-caught garden earthworms carry real risks — pesticides, heavy metals, or parasites from garden soil. Always use farm-raised earthworms from a reputable UK supplier rather than worms dug from your garden.

How many worms should I feed my axolotl?

For an adult axolotl (9 inches+), feed 4–6 Dendrobaena worms daily or every 2–3 days. For growing juveniles (3–9 inches), feed 2–5 worms 2–3 times daily. Always remove uneaten food within 20 minutes to protect water quality.

How often should I feed my axolotl?

Hatchlings and early juveniles need live food available 24/7. Growing juveniles (3–9 inches) should be fed 2–3 times daily. Adults (9 inches+ or 9 months+) should be offered food daily but can go 2–3 days without eating. Overfeeding adults is one of the most common mistakes new owners make.

What size worms are best for axolotls?

The food item should be no wider than the space between your axolotl's eyes at every life stage. For adults over 7 inches, most can handle full-sized Dendrobaena worms. Younger axolotls need pieces cut with scissors — start small and increase size as they grow and get more confident.

Are Dendrobaena worms safe for axolotls?

Yes, completely safe and widely considered the best live food option available in the UK. Soft-bodied, easily digestible, high in protein, and when farm-raised, carry no risk of pesticides or parasites.

How long do live worms last for axolotl feeding?

Stored correctly — in a ventilated container at 8–15°C with damp bedding — Dendrobaena worms will live for 2–4 weeks. A 50g pack typically lasts 2–3 weeks for a single adult axolotl. A 100g pack lasts around 3–4 weeks. Feeding the worms a small amount of worm chow keeps them healthy and extends their lifespan.

How much do I need per month for one axolotl?

A single adult axolotl fed every 2–3 days will typically go through around 100–200g per month. Our 100g pack is a good starting point for one adult axolotl. Our 200g pack is ideal for one axolotl with some spare. For two axolotls, a 500g monthly supply is comfortable with minimal waste.

Can I feed my axolotl frozen worms?

You can freeze Dendrobaena worms and use them later — freezing kills any potential pathogens. Thaw them fully at room temperature before feeding. Live worms are preferable because the movement triggers the feeding response more reliably. Frozen bloodworms from a pet shop are a useful supplement but should be used as a treat rather than a staple from 3 inches onwards.

Do axolotls eat every day?

Young axolotls need food available constantly. Adult axolotls (9 inches+ or 9 months+) should be offered food daily but can comfortably go 2–3 days without eating — their metabolism slows significantly as they mature. Feeding adults too frequently is one of the most common mistakes new owners make.

Are pellets okay for axolotls?

From 3 inches onwards, yes. Quality pellets like NT Labs Pro-F Axolotl Pellets can be used as a staple diet at a rate of 1–2 pellets per inch of axolotl. Before 3 inches, pellets are not suitable — young axolotls need live moving food. Most keepers find a combination of live worms and quality pellets works best long-term.

My axolotl spits out the worm — what's wrong?

Worm too large is the most common cause — cut it smaller. With Dendrobaena, try cutting smaller before writing them off entirely. If you are using red wigglers the bitter secretion is the likely culprit. Switch to Dendrobaena and you will almost certainly not see the same problem.

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Order live Dendrobaena worms — UK delivery

All our Dendrobaena worms are raised on our farm in Huddersfield, Yorkshire. We ship across the UK with a live arrival guarantee, and every order comes packed to keep your worms healthy in transit.

Not sure about tank setup yet? Read our complete guide to fishless cycling — because feeding a healthy axolotl starts with a cycled tank.