What Do Axolotls Eat in Captivity?
Axolotls are carnivorous predators with specific dietary needs that change dramatically as they grow. Feeding the wrong foods — or the right foods in the wrong size — causes digestive issues, growth problems, and water quality crashes.
This guide covers exactly what to feed, what to avoid, and how to provide balanced nutrition at every life stage.
Best Staple Foods for Axolotls
These foods should make up 90% of your axolotl’s diet. Not all “axolotl foods” sold online actually meet their nutritional requirements.
Earthworms (Nightcrawlers)
The gold standard for adult axolotl nutrition:
- Nutritionally complete with perfect calcium:phosphorus ratio
- No supplementation required when this is the staple
- Relatively low waste production
- Readily accepted by almost all adults
Important: Only use garden worms from pesticide-free areas, or farm-raised bait worms. Wild-caught worms carry parasite risk. Chop to appropriate size for your axolotl’s mouth.
Blackworms
Excellent staple for juveniles and subadults:
- Small size perfect for growing axolotls
- High protein content supports rapid growth
- Live blackworms stay in the water column longer
- Culturing at home creates endless sustainable supply
The only drawback: they can be messy if uneaten. Remove any leftovers after 15 minutes.
Bloodworms (Frozen, Not Freeze-Dried)
Good treat or supplement, NOT a complete staple:
- Excellent for enticing picky eaters
- Good transitional food for new arrivals
- Nutritionally incomplete as a sole diet
- Never use freeze-dried — causes impaction risk
Frozen bloodworms are fine as 10-20% of the diet, but don’t rely on them exclusively.
High-Quality Pellets
Convenient staple option for busy keepers:
- Only use soft sinking pellets specifically formulated for axolotls
- Rangen, Salmon pellets, and axolotl-specific brands work well
- Hard floating fish pellets are unsuitable
- Soak briefly before feeding to prevent floating issues
Pellets work best when rotated with worm-based foods for variety and complete nutrition.
Foods by Life Stage
What works for an adult will kill a tiny baby. Match food size and type to their current size:
Hatchlings (Under 2 inches)
- Newly hatched brine shrimp (BBS), decapsulated
- Microworms
- Moina / baby daphnia
- Diced blackworms (once they reach 1.5 inches)
Feed 2-3 times daily, removing uneaten food immediately. Hatchlings grow fast and need constant nutrition.
Juveniles (2-5 inches)
- Whole blackworms
- Chopped earthworms
- Small sinking pellets
- Frozen bloodworms
Feed once daily, adjusting amount based on appetite and growth rate. This is their fastest growth phase.
Subadults (5-8 inches)
- Chopped earthworms
- Whole blackworms
- Medium sinking pellets
- Occasional frozen bloodworms as treats
Feed 5-6 times weekly. Growth slows but nutrition remains important.
Adults (8+ inches)
- Whole earthworms cut into appropriate pieces
- Large sinking pellets
- Occasional whole blackworms
- Treats 1-2 times weekly maximum
Feed 2-3 times weekly only. Overfeeding adults causes more problems than underfeeding. Use the axolotl feeding calculator for precise portions.
Rule of thumb: Food pieces should be no wider than the space between their eyes. This prevents choking and impaction.
Foods You Should Absolutely Avoid
These commonly recommended foods cause health problems:
Freeze-Dried Anything
- Causes severe impaction risk
- Expands after eating
- Nutritionally poor
- Even “high quality” freeze-dried foods are problematic
Feeder Fish
- Carry parasite and disease risk
- Bones can cause impaction
- Fish aggressively compete for food
- Most fish nip axolotl gills anyway
The risk simply isn’t worth the questionable nutritional benefit.
Processed Meat / Human Food
- Seasoning, preservatives, and fat content are toxic
- Wrong calcium:phosphorus ratio
- Causes fatty liver disease long-term
No beef heart, no chicken, no table scraps.
Floating Pellets
- Axolotls feed from the bottom
- Floating pellets encourage gulping air
- Typically formulated for warm water fish anyway
Always use sinking pellets specifically.
Feeding Techniques That Reduce Waste
90% of water quality issues trace back to poor feeding technique:
Target Feeding
Use tweezers or a pipette to place food directly in front of them. This:
- Ensures they actually get the food
- Reduces the amount that rots unseen
- Lets you monitor appetite directly
- Builds positive association with your presence
The 15-Minute Rule
Anything not eaten after 15 minutes gets removed. Period. No exceptions.
- Set a timer if you need to
- Don’t come back “in a little bit” and forget
- Use a turkey baster for easy removal of uneaten food
Uneaten food decomposes fast, crashing water quality and causing stress even if you can’t see it happening.
Feeding Dish
A small, shallow ceramic dish in the tank:
- Contains food in one location
- Prevents worms from burrowing into substrate
- Makes leftover removal much easier
- Teaches them where to go for food
Most axolotls learn to use a feeding dish reliably within 2-3 weeks.
Signs Your Diet Needs Adjustment
Watch for these indicators that something is nutritionally off:
Growing But Skinny
They’re getting longer but their body stays thin. Usually means insufficient protein or too many empty calories from pellets. Solution: increase earthworm ratio.
Constantly Begging But Not Growing
They act ravenous all the time but don’t put on size. Usually means food is nutritionally incomplete. Solution: switch to blackworms and earthworms as primary diet.
Stringy White Waste
Indicates digestive upset from unsuitable food. Solution: eliminate pellets and frozen foods temporarily, feed only worms for 2 weeks.
Floating After Every Meal
Food is causing gas. Usually means pellets weren’t soaked, or you’re feeding freeze-dried products. Solution: soak pellets thoroughly or switch foods.
Common Feeding Questions
Q: Can I just feed pellets?
A: Technically yes, but most keepers see better long-term results with a 70% worm, 30% pellet rotation. All-pellet diets occasionally cause long-term kidney issues in some individuals.
Q: How long can they go without food?
A: Healthy adults can easily go 2-3 weeks without eating during cool temperatures. Juveniles should not go more than 3-4 days. Appetite refusal itself is not an emergency — the context around it matters.
Q: Do they need vitamin supplements?
A: If earthworms are your staple, no. If you’re feeding primarily pellets or cultured worms, occasional calcium powder is a reasonable precaution.
Q: My axolotl only likes bloodworms. Is that okay?
A: Short term, yes. Long term, bloodworms are nutritionally incomplete. Gradually introduce worms or pellets over several weeks.
For more detailed schedule information, see how often to feed an axolotl. For young individuals, use the complete baby axolotl feeding guide.