Celestial Eye goldfish

What it is

The Celestial Eye goldfish is a distinctive variety of fancy goldfish characterised by a pair of telescope eyes that turn vertically. The pupils appear to gaze permanently skyward. This breed possesses an elongate, egg-shaped body similar to the bubble-eye goldfish and lacks a dorsal fin entirely. Its paired fins are of the fantail or ryukin type, and the tail fin can be as long as the body itself. Most specimens display metallic scales in shades of orange, red, or white, though nacreous varieties exist. Despite their unusual appearance and lack of a stabilising dorsal fin, they remain active swimmers.

Where it lives

This breed first appeared in the 18th century, likely as a mutation of the telescope goldfish. Historical records point to origins in either China or Korea, with a Chinese scroll from 1772 providing early documentation. The fish reached Japan in 1903, where breeders established significant export stocks until the Second World War. American enthusiasts imported them in the early 1900s, later sending stock to Great Britain. Today, most exports from Asia originate from China. They thrive in freshwater aquariums with stable temperatures between 21 °C and 23.89 °C.

How it lives

Young fry hatch with normally positioned eyes. Over the first six months, the eyeballs enlarge and reposition so the pupils face upward. This change is purely genetic, disproving old myths about light-seeking mutations in clay jars. Due to their vertical field of vision, Celestials cannot compete well for food against faster breeds like standard telescopes. They are best kept alone or with similar slow-moving varieties such as bubble-eyes. Their large, protruding eyes are prone to injury, requiring tanks free of sharp gravel, rocks, or hard-edged decorations to ensure safe navigation.

Breeding and life cycle

Spawning produces many fry that mature into standard telescope-eyed fish rather than Celestials. These non-upward-looking variants are known as Deme-ranchu. The upward eye shift occurs naturally without environmental triggers. British breeders have selected for deeper bodies and shorter fins, while Chinese breeders often cross Celestials with Lionheads, Ranchus, or Pompoms. These hybrids may exhibit blockier bodies, nasal growths, and a wider colour range including black and chocolate, but they tend to be less active swimmers.

Fish and people

Aquarists value this breed for its unique appearance but must provide specific care. Smooth-bottomed tanks with silk or soft-leaved live plants like Anubias are recommended to protect their vulnerable eyes. Goldfish can be destructive to vegetation, so sturdy epiphytic species are preferred. The Celestial Eye was featured on a 1960 Chinese postage stamp. While not as common in general shops as other varieties, specialist dealers import them globally. They are considered somewhat sensitive to temperature fluctuations compared to hardier cold-water goldfish strains.

Relatives and look-alikes

The Toadhead, or Hama-tou, is believed to be an ancestor, featuring upward eyes with small bubble-like sacs beneath them. It shares traits with both the Celestial and the bubble-eye goldfish. The Deme-ranchu is identical in body shape but retains lateral-facing telescope eyes. Standard telescope goldfish share the protruding eye trait but lack the vertical orientation. Bubble-eye goldfish share the egg-shaped body and lack of a dorsal fin.

Questions people ask about Celestial Eye goldfish

Good reading and sources

• Celestial Eye on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data