The term aquatic refers to water and can refer to the following:

Marine biology

Oceanography – study of marine environments

Shorthand for an aquatic plant.

Aquatic ecosystem, an ecosystem located in a body of water.

Limnology – study of inland waters

Aquatic animal

Freshwater biology

Oceans, estuaries, lakes, rivers, streams, wetlands, and ponds (aquatic environments).

Aquatic ecology (limnology), a discipline that uses the principles and methods of ecology to study natural Aquatic ecosystems.

Aquatics, another name for watersports.