harlequin fish Directory References Images Discover Will Light-Speed Space Travel Ever Be Possible? New Seven Wonders of the World How Did the Sperm Whale Get Its Name? 7 Deadliest Weapons in History Roman Catholic Saints Timeline of the American Civil Rights Movement 10 Best Hockey Players of All Time Contents harlequin fish tropical fish Ask the Chatbot a Question Ask the Chatbot a Question 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