Fish
Hiroshima Goldfish
Carassius auratus
Origin: The Hiroshima goldfish is a unique ornamental goldfish variety developed in Hiroshima Prefecture, Japan. Selective breeding in the region dates to the Meiji period (late 19th century). Hiroshima became a center of a distinct Japanese goldfish tradition producing fish with a characteristic metallic scale luster — nishiki.
Also known as: Hiroshima Nishiki, Hiroshima fancy goldfish
Fact sheet
- Size
- 20 cm
- Lifespan
- 15 years
- Minimum tank size
- 150 L
- Temperature
- 15–22 °C
- pH
- 7–8
- Hardness GH
- 8–15 °dH
- Temperament
- Peaceful
- Social behavior
- Schooling
- Swimming zone
- Middle
- Diet
- Omnivore
- Jumps out
- No
- Eats plants
- Yes
Overview
The Hiroshima goldfish, or Hiroshima Nishiki, is a rare Japanese fancy goldfish variety distinguished by its metallic-lustrous scales and compact, rounded body. The unique scales create a mother-of-pearl or iridescent shimmering effect, highly prized in Japan. Specialized fish farms in Hiroshima Prefecture are the main breeders. Like all fancy goldfish, it requires a spacious aquarium or garden pond with strong filtration and aeration. It is a coldwater species sensitive to high temperatures. Nishiki goldfish are exhibited at prestigious Japanese competitions and exported to collectors worldwide.
Appearance
The body is rounded and short, typical of the fantail goldfish body plan. The defining feature is the metallic, lustrous scales with a pearlescent or iridescent sheen. The caudal fin is double and forked. Coloration varies — red, orange, white, black, or combinations — always with the characteristic metallic gloss. Adults reach 15–20 cm.
Care
House in a tank of at least 150 L, ideally a garden pond. Temperature 15–22 °C (tolerates brief drops to 5 °C). pH 7.0–8.0, GH 8–15. Powerful filtration is mandatory. Change 30–40% of the water weekly. Secure plants as goldfish uproot live vegetation.
Feeding
Omnivorous. Accepts quality goldfish pellets and flakes, live or frozen bloodworm, earthworm, and brine shrimp. Vegetable supplements aid digestion. Feed 2–3 times daily; avoid overfeeding.
Compatibility
Best kept with other goldfish of similar size and swimming style. Do not mix with tropical fish due to differing temperature requirements.
Breeding
Spawns in spring when temperature rises to 18–20 °C. Eggs scattered among plants or spawning mops; remove adults after spawning. Strict culling is needed to retain the metallic scale trait.
Fun facts
The Hiroshima goldfish is considered a hallmark of Hiroshima Prefecture's aquaculture artistry. The metallic scale luster is maintained through rigorous selective breeding. These fish are exhibited at Japanese competitions and sought by collectors worldwide.