fish swimming in aquarium with float glass background

>For the Russian band, see Aquarium (group); for the album by the Danish pop-dance group Aqua see Aquarium (album). An aquarium (plural aquariums or aquaria) is a clear-sided container (typically constructed of glass or high-strength plastic) in which water-dwelling plants and animals (usually fish, and sometimes invertebrates, as well as amphibians, marine mammals, and reptiles) are kept in captivity, often for public display; or it is an establishment featuring such displays. Aquarium keeping is a popular hobby around the world, with about 60 million enthusiasts worldwide. From the 1850s, when the predecessor of the modern aquarium was first developed as a novel curiosity, the ranks of aquarists have swelled as more sophisticated systems including lighting and filtration systems were developed to keep aquarium fish healthy. Public aquaria reproduce the home aquarist's hobby on a grand scale — the Osaka Aquarium, for example, boasts a tank of 5,400 m³ (1.4 million U.S. gallons) and a collection of about 580 species of aquatic life. See more at Wikipedia.org...

>For other uses, see Fish (disambiguation). Conodonta HyperoartiaPetromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish)GaleaspidaPituriaspidaOsteostraci Gnathostomata (jawed vertebrates)PlacodermiChondrichthyes (cartilaginous fish)AcanthodiiOsteichthyes (bony fish) Actinopterygii (ray-finned fish)Sarcopterygii (lobe-finned fish)Actinistia (coelacanths)Dipnoi (lungfish) See more at Wikipedia.org...