harlequin fish Directory References Images Discover 9 American Political Scandals Inventors and Inventions of the Industrial Revolution Why Did the Soviet Union Collapse? Did Marie-Antoinette Really Say “Let Them Eat Cake”? 26 Decade-Defining Events in U.S. History Why Do Some Cicadas Appear Only Every 17 Years? Timeline of the 2000s Contents harlequin fish tropical fish Also known as: Rasbora heteromorpha Learn about this topic in these articles:description In rasbora…the most popular being the harlequin fish, or rasbora (R. heteromorpha), a reddish fish 4–5 cm (1.5–2 inches) long with a wedge-shaped black spot on each side.Read More