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Harlequin rasbora

Fish
The harlequin rasbora is a small fish in the family Cyprinidae. The species became an instant favorite among aquarists after its introduction in the early 1900s and is the best known and most widely kept species among the rasboras. Wikipedia
Scientific name: Trigonostigma heteromorpha
Size: 2 inches
Domain: Eukaryota
Family: Cyprinidae
Genus: Trigonostigma
Order: Cypriniformes