Aquatic environment is a biological system in a waterway. Networks of life forms that are reliant on one another and on their condition live in sea-going biological systems. The two fundamental sorts of sea-going biological systems are marine environments and freshwater environments. Marine biological systems, the biggest of all ecosystems, spread roughly 71% of the Earth's surface and contain around 97% of the planet's water. They create 32% of the world's net essential production. They are recognized from freshwater biological systems by the nearness of broke up mixes, particularly salts, in the water. Roughly 85% of the broke up materials in seawater are sodium and chlorine. Seawater has a normal saltiness of 35 sections for every thousand of water. Real saltiness fluctuates among various marine biological systems.