Coldwater fish, in the context of aquariums, refers to fish species that prefer cooler water temperatures than tropical fish, typically below 20 °C (70 °F). Some examples are koi and goldfish. These species tend to grow more slowly, live longer than fish that live in warmer waters and are generally felt to be easier to keep. A tropical display tank at the Georgia Aquarium An aquarium (plural aquariums or aquaria) is a vivarium, usually contained in 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... Atlantic herring, Clupea harengus: the most abundant species of fish in the world. ... Tropical fish includes fish found in tropical enviornments around the world, including both fresh water and salt water species. ... Binomial name Cyprinus carpio (Linnaeus, 1758) Koi (Japanese: 鯉, koi) are ornamental domesticated varieties of the common carp Cyprinus carpio. ... Trinomial name Carassius auratus auratus (Linnaeus, 1758) The goldfish (Carassius auratus auratus) was one of the earliest fish to be domesticated, and is still one of the most commonly kept aquarium fish. ...

Varieties

• Salmonidae
• Salmon
• Oncorhynchus
• Trout

The term is also used to refer to fish species in the wild, such as lake trout , arctic char and arctic grayling that prefer colder waters. Genera (see text) Salmonidae is a family of ray-finned fish, the only family of order Salmoniformes. ... The Chinook or King Salmon is the largest salmon in North America and can grow up to 58 long and 126 pounds. ... Species See text The genus Oncorhynchus --derived from the Greek words onkos (hook), rynchos (nose)--contains the Pacific salmon and trout species. ... Rainbow trout (Oncorhynchus mykiss) Biwa trout (Oncorhynchus masou subsp) Trout is the common name given to a number of species of freshwater fishes belonging to the salmon family, Salmonidae. ... Binomial name Salvelinus namaycush (Walbaum, 1792) Lake trout (Salvelinus namaycush) is a freshwater char living mainly in lakes in northern North America. ... Binomial name Salvelinus alpinus Linnaeus, 1758 Arctic char or Arctic charr (Salvelinus alpinus) is a freshwater fish in the Salmonidae family, native to Arctic, sub-Arctic and alpine lakes and coastal waters. ... Binomial name Thymallus arcticus (Pallas, 1776) The Arctic grayling (Thymallus arcticus) is a species of freshwater fish in the salmon family (family Salmonidae) of order Salmoniformes. ...