Axolotls are paedomorphic salamanders that retain larval features throughout their lives. Their specific welfare needs require careful attention and specialist knowledge from keepers.
Axolotl welfare in captivity depends almost entirely on water quality management. These animals absorb dissolved substances directly through their permeable skin - ammonia, chlorine and heavy metals are immediately toxic. Inadequate filtration, irregular water changes and inappropriate temperature cause chronic physiological stress that manifests as gill damage, skin lesions and reduced activity. Their cool-water requirements mean UK summers pose a genuine risk - aquarium chillers may be necessary to maintain safe temperatures. Many axolotls are kept by enthusiastic beginners who underestimate these requirements; the result is preventable suffering from poor water quality.