Aquatic animal

An animal that lives in marine or freshwater environments for all or much of its life. Aquatic animals range from fully water-dependent species to animals that regularly move between water and land.

Aquatic respiration: The exchange of respiratory gases by animals in aquatic environments. Water holds less available oxygen than air, shaping how aquatic animals obtain it.
Fish locomotion: The ways fish propel and steer themselves through water. Tail strokes and fin control show how aquatic bodies generate thrust and maneuver.
Fisheries: The harvesting and management of wild aquatic organisms for food or other products. Fisheries depend on aquatic animals and can alter their populations.
Terrestrial animal: An animal that lives primarily on land. Its primary habitat presents different challenges for breathing, support, and movement.
Gills: Organs that extract dissolved oxygen from water and release carbon dioxide. Many aquatic animals use gills to breathe while submerged.
Aquatic adaptation: An inherited trait that improves an organism's survival or reproduction in water. This broader concept connects anatomy and behavior to life in aquatic habitats.
Aquaculture: The farming of aquatic organisms, including fish, shellfish, and seaweed. It raises aquatic animals for food while creating distinct management and welfare challenges.
Amphibious animal: An animal adapted to live and function both in water and on land. Amphibious animals regularly cross the habitat boundary rather than living mainly in water.
Osmoregulation: The control of water and dissolved ions in an organism's body. Freshwater and seawater impose opposite challenges to an animal's internal water balance.
Lateral line: A sensory system in fish and some aquatic amphibians that detects water movement and pressure changes. It lets animals detect nearby motion even when vision is limited.

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FishNarrower topic: Fish are aquatic animals, but the larger group also includes mammals and invertebrates.