The rainbow shark is a species of Southeast Asian freshwater fish from the family Cyprinidae. It is also known as the ruby shark, red-fin shark, red-finned shark, rainbow sharkminnow, green fringelip labeo, whitefin shark and whitetail sharkminnow. It is a popular, semi-aggressive aquarium fish

These fish have a distinctive appearance: long, dark bodies, pointed snouts and a flat abdomen. Their fins are typically red/orange in color. When fully grown, rainbow sharks can reach 6 inches in length. They're highly-territorial fish and are prone to aggressive behaviors towards other, smaller fish.