Axolotls are critically endangered in the wild but widely kept as companion animals. Their specific water quality, temperature, and substrate needs are frequently unmet, causing preventable welfare harm.
Axolotl welfare is compromised most frequently by water quality and temperature problems that are entirely preventable with appropriate equipment. Axolotls require cool, well-oxygenated, filtered water — their temperature requirements of 14-18°C rule out keeping them in most homes without a chiller, a reality that many buyers discover too late. Ammonia toxicity from inadequate filtration causes gill damage, lethargy, and death. Coarse substrate causes gut impaction when axolotls accidentally ingest it during feeding — bare-bottom tanks or fine sand are the only appropriate options. Axolotls should not be housed with other species that may nip their feathery external gills. The wild axolotl's critical endangerment means the entire captive population has independent conservation significance, raising the welfare stakes of proper husbandry.