What is the term used to describe an organism that is associated with a water environment?

The term "aquatic" is used to describe organisms that are associated with a water environment, including freshwater and saltwater ecosystems. Aquatic organisms can be fully submerged in water or live on its surface. This encompasses a wide variety of life forms, including fish, amphibians, aquatic plants, and some microorganisms, which have adapted to thrive in their water-based habitats.

While "marine" refers specifically to organisms living in saltwater environments like oceans and seas, and "amphibious" describes organisms that can live both in water and on land, "aquatic" is the broader term that encompasses both freshwater and saltwater life. "Terrestrial" pertains to organisms that live primarily on land, distinguishing it from those that are connected to water environments. Hence, "aquatic" is the most comprehensive and correct term to describe organisms associated with water environments.