Aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life.It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin.
Aquatic animals belongs to freshwater or saltwater. However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc.
Aquarium fish also known as Ornamental fishes are water-dwelling animals that are kept in transparent vivarium. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, marine mammals, turtles, and aquatic plants.
A fish hobbist maintains an aquarium, typically constructed of glass or high strength plastic. Fish Philatelist collects used or mint stamps with various philatelic materials.
AQUATIC PLANTS
Aquatic plants, also called hydrophytic plants or hydrophytes, are plants that have adapted to living in or on aquatic environments. Because living on or under water surface requires numerous special adaptations, aquatic plants can only grow in water or permanently saturated soil. Aquatic vascular plants can be ferns or angiosperms . Seaweeds are not vascular plants but multicellular marine algae, and therefore not typically included in the category of aquatic plants. As opposed to plants types such as mesophytes and xerophytes, hydrophytes do not have a problem in retaining water due to the abundance of water in its environment. This means the plant has less need to regulate transpiration.
AQUATIC ORGANISMS
A wide variety of organisms utilize in aquatic environments. They range in size from microscopic protzoa to the enormous sperm whale. Many aquatic organisms spend their entire lives in water, either in freshwater streams, rivers, and lakes, or in marine or estuarine habitats. Other aquatic organisms only spend part of their lives in water.
FRESHWATER AQUARIUM FISH
Freshwater fish are fish that spend some or all of their lives in freshwater, such as rivers and lakes, with a salinity of less than 0.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations in order to keep the ion concentration of their bodies balanced. 41% of all known species of fish are found in freshwater.
A vast number of species of fish have been successfully kept in the home freshwater aquarium. This list gives only some of the most commonly-kept species
They mainly belongs to following catagories kept in Aquarium
Bichirs and reedfish
Catfish
Characins and other characiformes
Cichlids
Cyprinids Killifish Labyrinth fish
Live-bearers
Loaches and related cypriniforms
Neotropical Electric Fish
Puffer Fish
Rainbow Fish
Spiny Eels
Gar
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