The Black Ranchu is a popular variety of goldfish known for its unique appearance and charming characteristics. Here are some key details about the Black Ranchu:

Appearance

• Color: True to its name, the Black Ranchu is typically a deep, solid black color, which distinguishes it from other goldfish varieties.
• Body Shape: The Ranchu has a distinctive rounded body with a prominent hump on its back, just behind the head. Unlike other goldfish, the Ranchu does not have a dorsal fin, which gives it a smooth, arched back.
• Head Growth: It features a prominent "wen" or hood, which is a fleshy growth on the head that gives it a unique and somewhat puffy appearance. The wen can vary in size and shape, adding to the distinctiveness of each fish.

Size

• Black Ranchus typically grow to about 6 to 8 inches (15 to 20 cm) in length, but their size can vary depending on their environment and care.

Behavior

• Temperament: Like most goldfish, Black Ranchus are generally peaceful and do well in community tanks with other non-aggressive fish.
• Swimming: Due to their rounded bodies and lack of a dorsal fin, Ranchus are slower swimmers. They often swim with a waddling motion, which many fish enthusiasts find endearing.

Care Requirements

• Tank Size: A minimum of 20 gallons (75 liters) is recommended for a single Black Ranchu, with an additional 10 gallons (38 liters) for each additional fish.
• Water Conditions: They prefer cooler water temperatures, generally between 65-72°F (18-22°C), with good filtration and regular water changes to maintain water quality.
• Diet: Ranchus are omnivorous and will thrive on a balanced diet of high-quality pellets, flakes, and fresh or frozen foods like bloodworms, brine shrimp, and vegetables.

Special Considerations

• Wen Care: The wen of a Black Ranchu requires particular care as it can sometimes become overgrown or prone to infections. Regular monitoring and maintaining good water quality are essential to prevent issues.
• Compatibility: Due to their slower swimming speed and unique needs, it's best to keep them with other fancy goldfish varieties rather than faster, more competitive fish.

Black Ranchus are cherished for their distinctive appearance and gentle nature, making them a favorite among goldfish enthusiasts. If you're considering adding one to your aquarium, make sure to provide a suitable environment that meets their specific needs.