harlequin fish Directory References Images Discover The 6 Deadliest Earthquakes Since 1950 Timeline of the 1980s Did Marie-Antoinette Really Say “Let Them Eat Cake”? Why Do Some Cicadas Appear Only Every 17 Years? Timeline of the Titanic’s Final Hours 11 Egyptian Gods and Goddesses Why Did the Soviet Union Collapse? 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