You searched for: “aquatic animal
aquatic animal (s) (noun), aquatic animals (pl)
A creature that lives in water: Aquatic animals require a watery habitat, but they do not necessarily have to exist entirely in such a liquid environment or situation.

Wildlife habitats are classified as either aquatic (water), terrestrial (land), or amphibious (water and land).

A unit related to: “aquatic animal
(Latin: otter; aquatic animal)