Aquarium
A tank of water in which fish and other water life are kept, at home or in a public aquarium.
Also: fishkeeping, fish tank
Keeping fish in tanks has a long history, from goldfish bowls in China to the glass-sided aquariums popular in Victorian Britain. Today fishkeeping is one of the most common pet hobbies. Freshwater tanks hold guppies, tetras, barbs, gouramis, cichlids and catfish, while marine tanks keep reef fish and corals. A healthy tank needs filtering, the right temperature and a settled nitrogen cycle. Most freshwater aquarium fish are now bred in farms, many in South-East Asia and in Kolkata and Chennai in India, but many marine fish are still caught from reefs.