1. (neritic) Describing a narrow zone in the sea or ocean that extends from low-tide mark (the edge of the littoral zone) to the edge of the continental shelf. The depth increases to about 200 m. The water is well oxygenated and light penetrates to the bottom. The temperature and salinity are fairly constant except near the shore line. In shallower regions sessile algae such as Ulva and Laminaria are found.
2. Describing the area of a lake or pond extending from the edge of the area oc-cupied by rooted aquatic plants to about 10 m, i.e. to a depth below which the water becomes considerably colder.
3. Describing organisms that live in the sublittoral zone.