Description
Developed in Japan, Ranchu are very popular amongst goldfish enthusiasts. The Ranchu Bronze is a refined and elegant variant of the traditional Ranchu goldfish, noted for its rich metallic brown to deep copper hues and its lack of a dorsal fin. Bred for symmetry, head growth, and smooth body contours, this variety is especially popular among enthusiasts of high-grade ornamental goldfish. Like all Ranchu types, it is slow-moving and thrives in carefully maintained aquariums that accommodate its unique physical structure and gentle temperament.
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Features of a Ranchu Bronze
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Distinctive bronze to copper coloration with metallic sheen
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Rounded, deep body shape with a smooth, arched back
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Lacks dorsal fin, contributing to a clean silhouette
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Prominent head growth (wen), typically covering the crown and cheeks
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Grows up to 15 cm in length under optimal conditions
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Deliberate swimmer, sensitive to strong currents and sudden water changes
The Best Aquarium Size for Ranchu Bronze
A single Ranchu Bronze requires a minimum of 75 litres to allow adequate space for swimming and waste dilution. For every additional fish, add 35–40 litres. A long, shallow tank layout is preferred to reduce swimming stress and aid access to the surface.
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Tank Mate Compatibility for Ranchu Bronze
Due to their docile nature and limited agility, Ranchu Bronze should be housed with similarly slow, non-aggressive fish. Suitable companions include:
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Oranda Goldfish
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Telescope Goldfish
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Ryukin Goldfish
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Panda Moor Goldfish
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Weather Loach
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Rosy Barb (only if kept in low-aggression groups)
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Diet for Ranchu Bronze
Offer a varied, high-quality diet that promotes digestive health and enhances coloration. Recommended foods include sinking goldfish pellets, gel-based diets, blanched leafy vegetables, bloodworms, and brine shrimp. Feed small amounts multiple times daily, avoiding floating food to minimize swim bladder issues.
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Aquarium Setup for Ranchu Bronze
Aquarium Filtration
Use sponge or external canister filters with adjustable flow to maintain water quality while avoiding strong currents. Mechanical and biological filtration are critical due to the species’ high bioload.
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Aquarium Plants
Opt for robust, low-maintenance plants such as Java Fern, Anubias, and Water Sprite. These plants tolerate cooler water and low light while providing cover and oxygenation.
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Aquarium Lighting
Moderate, evenly distributed lighting is optimal. Provide 8–10 hours of light per day using LEDs to support plant life and prevent excessive algae.
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Aquarium Heating
Maintain stable water temperatures between 20–24°C using a reliable heater with a thermostat. Sudden fluctuations can stress the fish and affect their health.
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Aquarium Substrate
Choose soft sand or smooth gravel to protect the sensitive belly and head region of the fish. Avoid sharp or coarse substrates.
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Aquarium Decorations
Include rounded ceramic or stone decorations without rough edges. Ensure ample open space for swimming and resting areas under plants or ornaments.
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