The Bubble Eye Goldfish was first developed in China. The logical legend has it this variety created, and recreated though severe inbreeding originally was bred for selection among Telescope eye, and Celestial goldfish. These other two varieties were already severely inbred and selected for there particular eye socket mutations.
This is admittedly neat to look at once the symmetrical artistic epiphany is achieved through inbreeding recipes, and variety specific bloodlines that have already been created. Often this careful inbreeding is maintained so that the mutation from inbreeding remains balanced in favor of the traits that are desirable.
In Japan this goldfish is call suihogan.
The bubble eye has been bred to have twin caudal fins, and no dorsal fin. There is a caveat to the dorsal fin. This caveat is relative to where you are personally from. Various breeding artists in China have selected for bubble eye with a dorsal fin. This variety has not yet become popular in the western world.
In the USA the competitive judging process of the Gold Fish Society of America disqualifies any bubble eyed gold fish with any indication of even a bump where the dorsal fin could be.
It is conceivable that through a long process of severe selection and breeding that one could develop a bubble eye like goldfish with a dorsal fin outside of China. But this is not the artistic epiphany associated with the bubble eye as we know it. That goldfish would be called something else like dorsal fin bubble eye, or some other interesting name in some lingua franca; (the proper linguistic term for any Language, Creole, or Pigeon that trade is done in).
The sacs of the bubble eye are the creatures most striking feature to the eyes and fingertips of the human people who observe them. These sacs are filled with liquid. They are extremely delicate. They are the main reason why these fish are tank fish and not suited for most out door ponds, or water gardens.
Only the most strictly maintained water garden can host them if every conceivable rough surface, and abrupt edge is constantly and instantly removed. This is nearly impossible in an outside pond. Tree branches and leaves fall into the water, roots in search of moisture pop up through the bottom of the pond. These are issues that make it impossible for there bubble eye goldfish to maneuver almost completely blind in the water world.
Essentially what these creatures are is a result of breeders selecting for a kind of blindness in goldfish because humans find it visually interesting. That is not a value judgment. It is however, one relative quotient of the whole fact.
The eyes of the Bubble Eye varieties, like the Celestial goldfish point upward. This makes it very hard for them to locate food. They will locate it. But they will loose out on food and starve out if they are placed in with heartier goldfish, and competitive, better adapted, natural fish varieties.
When feeding them pick slowly sinking food. This gives them plenty of time to see it. If they have to feel about for the food a greater risk of popping a sack is introduced.
Do not feed them food that floats. This may seem counter intuitive, but bubble eye goldfish have large stomachs in a relative way. This makes them susceptible to internal constipation and swim bladder discomfort from taking in air while they consume floating food. Completely soaking the food first can help the food not rest above the surface tension of the water.
Feeding bubble eye goldfish with swim bladder discomfort frozen green peas for a few days after a twenty four hour fast is a recommended way to nurse them back to health quickly.
Housing them with other less light dependent goldfish is ideal. Such as the kinds they were originally bred from: Telescope & Celestial goldfish.
Some of the bubble eye coloration is stable: While other color varieties are not as stable.
The black variety for example can loose its tone easily based on how much light it is exposed to. This is also true for the gold toned varieties.
The colors of the Bubble Eye varieties, can span from the previously mentioned rare black, to blue & brown (a.k.a. chocolate), calico, red & black, red, red & white, and gold tones.
If they do puncture a sac it will grow back but not as symmetrical as before.
It is important for these fish to have calm water to swim in. If you have intake and output machines regulating there water way, and nitrate levels at forty parts per million. It is important that the pressures are not too extreme. It is already difficult for these goldfish to swim with the sacks. So, lower pushes and pulls to and from the water system is ideal.
Bubble Eye varieties need to have a minimum of ten gallons of water. Some bigger ones need above fifty-one gallons to thrive.
The ideal temperature for Bubble Eye Goldfish color and fin varieties to live well is relatively warm. They do best in water that is seventy-six to seventy-eight degrees.In extremely clean continuously filtered water temperature can go as high as ninety-two degrees.
This beautiful bubble eye variety is the result of a long process of careful selection for a North American aesthetic.