🐟 The Ranchu Goldfish is characterized by its round body and lack of a dorsal fin. It's known for its unique appearance and graceful movement.
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🐟 The Ranchu Goldfish is characterized by its round body and lack of a dorsal fin. It's known for its unique appearance and graceful movement.
Round, egg-shaped body with no dorsal fin, giving a smooth arched back. Prominent “wen” (head growth) covering the face and gill plates. Available in orange, red, white, black, or bi-color varieties with metallic or matte scales.
10-15 years
🍽️ Ranchu Goldfish are omnivores and enjoy a diet that includes aquatic plants, small insects, fish flakes, and pellets.
Ranchu Goldfish are often called the “King of Goldfish” in Japan for their beauty and unique form. They require attentive care, a clean environment, and gentle companions to thrive.
Intermediate – sensitive to poor water quality and requires extra care due to body shape
20 gallons for the first Ranchu, +10 gallons per a
6.5 – 7.5
Soft to moderately hard water
18°C – 24°C (65°F – 75°F)
5 – 8 inches (12 – 20 cm)
Other fancy goldfish such as Oranda, Lionhead, Fantail, Ryukin; avoid fast or aggressive species
African Cichlids, Oscars, Jack Dempsey, Betta (male), Angelfish, Tiger Barbs, Cherry Barbs, Rosy Barbs, Zebra Danios, Neon Tetras, Guppies, Gouramis, Mollies, Platies, Swordtails, Shrimp, Snails
Carassius auratus
Cyprinidae
Japan (developed from Lionhead goldfish varieties)
Peaceful; best kept with slow-moving, similarly tempered goldfish
Feed 2–3 times a day with sinking pellets to avoid air gulping. Include vegetables to aid digestion and occasional protein treats for variety. Avoid floating foods to prevent swim bladder issues common in rounded-bodied goldfish.
Egg scatterers; breed in cooler water during spring-like conditions; no parental care, eggs must be separated to prevent being eaten
Males develop small breeding tubercles on gill covers and pectoral fins during spawning season. Females become rounder with eggs. Spawning is triggered by cooler water and increased feeding. Eggs hatch in 4–7 days, and fry require infusoria or powdered fry food initially.
Ammonia and nitrite should be at 0 ppm; nitrates under 40 ppm. Ranchus are sensitive to sudden parameter changes. Maintain strong but gentle filtration to avoid excessive current, as their swimming ability is limited.
Prone to swim bladder disorder, wen (head growth) infections, bacterial diseases, and ich. Wen needs occasional inspection and trimming if overgrown to avoid vision or feeding issues.
😊 Ranchu Goldfish are generally peaceful and can be kept with other goldfish varieties. Their distinctive appearance adds beauty to any aquarium or pond.
Gentle and calm swimmers. Not as agile as streamlined goldfish due to rounded body and lack of dorsal fin. Prefer slower tankmates and may rest at the bottom between activity.
The Ranchu Goldfish (Carassius auratus) is a prized Japanese fancy goldfish variety developed from the Lionhead goldfish. Recognized for its arched back, absence of a dorsal fin, and distinctive head growth known as a “wen,” the Ranchu is celebrated for its graceful swimming style and ornamental value. Due to its compact, rounded body, it is less agile than other goldfish and best kept with other slow-moving fancies. They require a spacious tank with low current, excellent filtration, and a varied diet rich in vegetables. Breeding follows the typical goldfish egg-scattering process, but fry need careful rearing. With proper care, Ranchus can live well over a decade and bring elegance to any goldfish collection.