Goldfish – Black Ranchu (Carassius auratus) 5cm
The Ranchu goldfish is a highly regarded fancy goldfish in Japan. These fish developed abnormal tissue growth on their heads as they mature, which breeders refer to as a ‘hood’. This can be several millimeters deep over much of the head such that it protrudes around the eyes, mouth, and gills. Ranches can reach between 6 and 8 inches (15 to 20 centimeters) in length and may come in orange, red, white, red-and-white, blue, black, black-and-white, black-and-red, natural, and chocolate coloration.