The realm of open water, called the pelagic zone, has the greatest volume and vertical range of any life zone. It includes the region above the continental shelf , called the neritic province, and the region beyond, called the oceanic province. Gradations in light, temperature, water chemistry, nutrient content, and pressure result in a diversity of environments that are filled by a large number of species.
how many fish are in the ocean
Abiotic and Biotic factors