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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

Ori­gin: Chi­na

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.