any of several cyprinid fishes of the genera Danio and Brachydanio, of India and Sri Lanka, often kept in aquariums.
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British Dictionary definitions for danio
any brightly coloured tropical freshwater cyprinid fish of the genus Danio and related genera: popular aquarium fishes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012