Celestial Eye Goldfish — Carassius auratus auratus
Celestial Eye Goldfish — Carassius auratus auratus or Choten gan is an egg-shaped, double-tailed breed of fancy goldfish. They have a breed-defining pair of telescope eyes which are turned upwards, pupils gazing skyward. When the fry hatch, the eyes of young Celestials are normal but gradually protrude sideways, as in the Telescope eye goldfish, and then turn upwards within a period of six months. The body is short and stubby with a double caudal (tail) fin and a double anal fin. The Celestial eye goldfish will swim in all areas of an aquarium space.
Common Name: Celestial Eye Goldfish, Celestial Goldfish, Deme-Ranchu
Scientific Name: Carassius auratus auratus
Sexing: During the breeding season the male has white prickles, called breeding tubercles, on its gill covers and head. Seen from above a female will have a fatter appearance when she is carrying eggs. It is impossible to sex Goldfish when they are young and not in breeding season, but generally the male is smaller and more slender than the female.
Breeding: Celestial Eye Goldfish — Carassius auratus auratus are egg layers that spawn readily in the right conditions. They can be bred in groups as small as five individuals, but they are very social animals and likely to breed in larger groups as well. The only time Goldfish will spawn in the wild is when spring arrives. To spawn them in the aquarium, you will need to mimic the conditions found in nature.
Provide an aquarium that is at least 20 gallons and make sure the fish are healthy and disease free. Many breeders will separate the males and females for a few weeks prior to breeding to help increase their interest in spawning. Introduce the fish into the breeding tank at the same time. The tank will need a lush environment with solid surfaces for the spawning process and for the eggs to adhere to. Bushy, oxygenating plants, such as Anacharis, work well for this, though artificial plants or fibrous spawning mops can also be used.
To induce spawning, the temperature can be slowly dropped to around 60° F (11° C) and then slowly warmed at a rate of 3° F (2° C) per day until they spawn. Spawning generally begins when the temperatures are between 68° and 74° F (20°-23° C). Feeding lots of high protein food such live brine shrimp and worms during this time will also induce spawning. Feed small amounts three times a day, but don’t overfeed. Uneaten scraps will sink to the bottom and foul the water. Maintain the breeding tank with partial water changes of up to about 20% per day.
Before spawning, as the temperature increases, the male Celestial Eye Goldfish — Carassius auratus auratus will chase the female around the aquarium in a non-aggressive way. This can go on for several days, and the fish will intensify in color. During the spawn, the fish will gyrate from side to side, and the male will push the female against the plants. This stimulates the female to drop tiny eggs which the male will then fertilize. The eggs will adhere by sticky threads to the plants or spawn mop. Spawning can last two or three hours and can produce up to 10,000 eggs.
At this point the parents will start to eat as many eggs as they can find. For this reason, it is best to remove the parents after spawning is complete. The fertilized eggs will hatch in 4 to 7 days, depending on the temperature. You can feed the newly hatched goldfish specialty fry foods until they become big enough to eat flake or brine shrimp, or you can offer the same food as you feed the parents as long as it is crushed very small. At first, the fry are a dark brown or black color in order to better hide and not be eaten by larger fish. They gain their adult color after several months and can be put in with larger fish once they reach about 1 inch long
Typical Adult Fish Size: 3 — 6 inches
Life Span: 10 -15 years. It has been known to live up to 25 years in some cases.
Natural Habitat: They inhabit the slow moving and stagnant waters of rivers, lakes, ponds, and ditches feeding on plants, detritus, small crustaceans, and insects.
Recommended Aquarium Capacity: 20 — 30 gallon tank for your first goldfish and then increase the size of the tank by 10 gallons for each additional goldfish. Bigger is better.
Species Compatibility: Water-Bubble Eye Goldfish, Telescope Goldfish, and Lion head Goldfish
Care Level: Not recommended for beginners. The Celestial eye goldfish ave a lower tolerance for poor water conditions. They need good care and lots of space.
Ideal Tank Ecosystem: Provide a gravel substrate to help create a natural and comfortable environment for your fish. You can add some decor. Remember that the eyes of the Celestial Eye Goldfish are a handicap and these fish have very poor vision. Make sure that all ornamentation is smooth with no protruding points or sharp edges.
Aquarium Water Temperature: Between 65 — 72° F (18°- 22° C)
Aquarium Water pH: Range 6.0–8.0
Feeding: The Celestial Eye Goldfish are omnivores. They will generally eat all kinds of fresh, frozen, and flake foods. To keep a good balance, give them a high quality flake food every day. Feed brine shrimp (either live or frozen), blood worms, Daphnia, or tubifex worms as a treat. Due to their upturned eyes, the Celestial Eye Goldfish have poor vision and a harder time seeing their food, so they need extra time to feed. They will also nibble on live floating aquarium plants like limnobium (frog bits) or salvnia.
Other Considerations: Through selective breeding, the Celestial Eye Goldfish developed eyes that are permanently locked in an upward position. This is one of more than 125 captive-bred fancy goldfish varieties.