Feeding an axolotl properly isn’t just about knowing what it likes — it’s also about understanding which foods must absolutely be avoided. Some items, even those that seem harmless, can cause stress, digestive issues or serious illnesses in this fragile amphibian. To keep your axolotl healthy, it’s important to remove a few common foods from its diet.

Foods Unsuitable for Their Digestive System

Axolotls have a simple digestive system adapted to a soft, animal-based diet. Their gut is not designed to process components found in other animal diets, and even less in human food. Here are the main foods that can cause problems:

• Tropical fish food (flakes, standard pellets): contains plant matter and additives they cannot digest
• Raw red or white meat (beef, chicken): too rich, difficult to digest and may promote bacterial growth
• Human leftovers: salt, spices, oils and sauces are toxic to axolotls
• Bread, pasta or cereals: completely unsuitable for their digestive system
• Insects collected outdoors: may carry pesticides or harmful parasites

Why “Standard” Pellets Are a Bad Idea

Many shops or non-specialised websites recommend “amphibian” or “universal” pellets, but these foods are rarely appropriate for axolotls. Many contain:

• Plant ingredients (algae, cereals)
• Artificial colourants
• Low-quality protein sources

Poor-quality pellets can cause constipation, loss of appetite or excess waste in the aquarium. If you choose pellets, they must be axolotl-specific, high in animal protein and free from additives.

The Problem With Oversized Food

Axolotls don’t chew — they swallow their prey whole by suction. Food that is too large can cause:

• Choking or food entering the gills
• Digestive impaction
• Stress or regurgitation

This also applies to earthworms: if they are too thick, cut them into smaller pieces. The same goes for raw shrimp, fish chunks or frozen food blocks. A good rule is to match the food’s size to the width of the axolotl’s head.

Foods That Are Dangerous or Toxic

Some foods should always be avoided, as they can harm your axolotl even in small amounts:

• Warm-water fish (guppies, platies): may transmit parasites
• Raw shrimp with shell: can carry bacteria or cause blockages
• Turtle or reptile food: unsuitable in composition and often too dry
• Fruits and vegetables: useless and indigestible for a strict carnivore

As a rule, never give your axolotl a food that isn’t specifically recommended for its species or validated by aquatic specialists.

Frozen Foods: Use With Care

Frozen bloodworms, brine shrimp or daphnia are often used as complementary foods. However:

• They must be properly thawed (in a bit of lukewarm water)
• Blocks should be rinsed to avoid releasing pollutants into the tank
• They should never be fed while still frozen

Improper handling can cause thermal shock or reduce water quality.

Fasting Is Not Dangerous

If you are unsure about a food item, do not feed it. Axolotls can go several days without eating with no negative effects. A short fast is safer than an improperly digested meal. If you are away or short on supplies, a 2–4 day break is completely fine for a healthy adult.

What If My Axolotl Ate Something Inappropriate?

Monitor its behaviour:

• Is it lethargic or unusually active?
• Does it show signs of bloating?
• Is it refusing food for several days?

If so, put the animal on a temporary fast, check that the water temperature stays around 16–18 °C, and avoid any stress. If symptoms persist, consult a veterinarian specialising in exotic pets.

Conclusion

An axolotl’s diet must be appropriate, fresh or high-quality, and given in reasonable amounts. Avoiding certain foods helps prevent digestive issues, illness, immune decline or premature death. When in doubt, stick to the basics: earthworms, specialised pellets, thawed larvae — and plenty of caution.