An aquatic ecosystem is an ecosystem in a body of water. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. Different types of aquatic ecosystems are as follows: 1. Freshwater Ecosystem: These cover only a small portion of the earth which is nearly 0.8 percent. Freshwater means lakes, ponds, rivers and streams, wetlands, swamp, bog, and temporary pools. 2. Lotic Ecosystems: These mainly refer to the rapidly flowing waters that move in a unidirectional way including the rivers and streams. Furthermore, these environments have numerous species such as beetles, mayflies, stoneflies and several species of fishes including trout, eel, minnow, etc. 3. Lentic Ecosystems: They include all standing water habitats. Moreover, lakes and ponds are the primary examples of the Lentic Ecosystem.  Also, these ecosystems contain algae, crabs, shrimps, and amphibians such as frogs and salamanders. 4. Wetlands: Wetlands are marshy areas and are sometimes covered in water which has a wide variety of plants and animals. Swamps, marshes, bogs, black spruce, and water lilies are the main examples in the plant species. The animal life of this ecosystem consists of dragonflies, damselflies, and various birds and fishes. 5. Marine Aquatic Ecosystem: The marine ecosystem covers the largest surface on the earth. Two-thirds of the earth is covered by water which constitutes oceans, seas, intertidal zone, reefs, seabed, etc. Form of each life is unique and native to its habitat. 6. Ocean Ecosystems: Our earth is having five major oceans. Moreover, these oceans are like a home to more than five lakhs aquatic species. Some species of this ecosystem include shellfish, Shark, Tube Worms, Crab Small, and large ocean fishes. 7. Coastal Systems: These are the open systems of land and water, joined together to form the coastal ecosystems. A wide variety of species of aquatic plants and algae live at the bottom of it. The diverse fauna consists of crabs, fish, insects, lobsters snails, shrimp, etc.