Healthy vs Unhealthy Axolotl Gills (Visual Guide)

Gills are the best visible health indicator for axolotls. Learning to read them helps you catch problems before they become serious.

What Healthy Gills Look Like

Healthy axolotl gills are:

• Full and fluffy: long, feathery filaments branching from each gill stalk
• Pink to deep red: color comes from blood flowing through the filaments
• Symmetrical: all six gills roughly the same size
• Responsive: axolotl flicks them occasionally to increase water flow
• Proportional: gill size roughly matches head width

The exact color varies by morph: leucistic gills appear bright pink-red, melanoid gills are darker reddish-brown, and wild type gills have a mix.

Warning Signs

Curled Gill Tips (Forward Curl)

Meaning: acute stress or irritation Common causes: ammonia/nitrite in water, sudden temperature change, chemical irritant Action: test water immediately, do a water change

Shrunken/Short Gills

Meaning: chronic poor conditions Common causes: long-term high ammonia, consistently warm water (above 22°C), poor nutrition Action: optimize all water parameters, improve diet, gills will regrow over weeks

Pale/White Gills

Meaning: reduced blood flow or anemia Common causes: stress, cold shock, illness, poor nutrition Action: check temperature (not too cold either), evaluate overall health

White Fuzzy Patches on Gills

Meaning: fungal infection Common causes: poor water quality combined with gill damage Action: salt baths, improve water quality, see fungus treatment guide

Missing Filaments (Bare Stalks)

Meaning: severe gill loss from disease or tank mate nipping Common causes: aggressive fish, another axolotl biting during feeding, severe fungal damage Action: remove the cause, ensure clean water, gills will regenerate

Gill Recovery Timeline

How to Keep Gills Healthy

1. Maintain water parameters (0 ammonia, 0 nitrite, < 20 ppm nitrate)
2. Keep water cool (16-18°C ideal)
3. Avoid strong water flow
4. Feed a balanced diet rich in protein
5. Avoid aggressive tank mates
6. Provide hides to reduce light stress