Aquatic habitat is any underwater environment that is capable of supporting life. The suitability of aquatic habitat is dependent on three variables, temperature, clarity, and oxygen.
All sources of water contribute to aquatic habitat. Small creeks and intermittent streams moderate the temperature of larger bodies of water since they are often completely shaded by brush or tree cover. These smaller water courses may also act as cover for small fish and provide habitat for aquatic insects.
Wetlands also play an important role in maintaining aquatic habitat. They provide shelter for many aquatic insects, which may be used as food for fish species, as well as providing oxygen and other nutrients to the water cycle.
Larger lakes and rivers provide habitat and spawning grounds for larger fish and other aquatic species.