noun
: any of various barred fishes: as
a. : a small Australian sea fish ( Melambaphes zebra ) of the family Girellidae that is olive above and pinkish below with nine dark crossbars
b. : a small dark-barred Canadian variety of the log perch
c. also zebra danio : a very small blue-and-silver-striped Indian danio ( Brachydanio rerio ) often kept in the tropical aquarium ; also : any closely related and similarly marked danio