Axolotl
Mexican aquatic amphibian that remains in larval form throughout its life. It's not a fish but lives in an aquarium. It needs cold water.
Detailed explanation
The axolotl (Ambystoma mexicanum) is a neotenic salamander: it maintains its external gills and larval form throughout its life. It is critically endangered in the wild.
Requires cold water: 16-20 degrees, never above 22. In summer a refrigerator or air-conditioned room is necessary.
The minimum aquarium is 60 litres for an individual. Fine sand substrate (not gravel - they swallow it and get clogged). No fish: he eats them or they bite his gills.
The diet is carnivorous: earthworms, axolotl pellets, frozen shrimp. The external gills regenerate if damaged.
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