Marine ecosystem is the largest ecosystem on the planet Earth Ecosystem refers to the reciprocal action of the living organism like plants, animals and other micro bacteria’s with the environment. And the study of the interaction of the organisms with their environment is called ecology. There are various life forms and ecosystems on the planet earth. The ecosystem of every area is unique and distinct due to the availability of specific living organism and physical conditions in that area. Every ecosystem in an area is finely balanced. Besides, every component of an ecosystem plays a vital role in maintaining it. The Earth consists of large and small terrestrial, marine, rain forest and coral reefs ecosystems. The marine ecosystem is the largest ecosystem on the planet earth. Two third of the earth’s surface is covered with the water and the depth of the marine ocean reaches up to 3800 feet in some places