Bubble eyed goldfish
The bubble eyed goldfish is called suihogan in Japan. It was developed in China around 1908 or possibly a little earlier.
The tails should be forked and completely split from each other. The back should be evenly curved with no sign of a dorsal fin, poorly bred fish will often have kinks or some unevenness where the dorsal fin should be. The sacs under the eyes should be well developed and even in size and shape.
Temp - 65 to 70°F.
Ammonia/Nitrite - no trace.
Nitrate - < 20ppm.
pH - 7.5
GH - avoid extremes.
KH - 5 to 12.
Bubble eyed goldfish are quite delicate creatures. It is slow moving and very easily damaged by anything sharp or poor handling. Bubble eyed goldfish are unable to compete with more ordinary fish, they are easily bullied and easily damaged because of this they will need a tank of their own.
Use fine sand or a bare bottomed tank because gravel could damage their eye sacs. It is also very important that there are no sharp edges on any aquarium decor included in their tank. If a power filter is in use make certain that it is fitted with a strainer over the intake pipe, take every care when siphoning water out of the tank during a routine water change because it only needs one second for a lapse of concentration to end up with a very distressing eye injury to one of these fish.
If one of the eye sacs is ruptured make sure that the aquarium is kept clean and use a general anti bacterial treatment until healing starts in order to prevent any secondary infections. The sac will heal and refill but it may never reach its full size and there will be an imbalance between the eyes which won't affect the fish's health but it would ruin a show fish. Bubble eyed goldfish don't have the extreme body shape common in a lot of fancy goldfish and as a result they rarely suffer from the floatation or sinking problems often associated with fancy goldfish in general.
Goldfish are omnivores with a slight preference for vegetable matter. The main thing when it comes to feeding them is to ensure they have a balanced diet for healthy growth and resistance to disease. Their mouths are slightly down-turned and it isn't natural for them to feed at the surface and it can lead to swim bladder and other digestive problems if they are forced to, so ideally all dried food should be pre soaked prior to feeding so that it will sink. Suitable food
If you go away on holiday rather than risk someone with no experience feeding them it is better if the fish are left without food.
For a healthy Goldfish to go two weeks with no food will do no harm at all. Being cold blooded their food requirements are far less than an equivalent sized mammal but the risk of over feeding poses a very real threat to their lives.
It has to be said that the bubble eyed goldfish is one of the more extreme varieties with the lack of a dorsal fin and the large fluid filled sac under each eye. This does mean that if the fish is not given the right care and environment there is a very real chance that it will come to harm and have a miserable existence.
Note about the photos, the article states that gravel is unadvisable with these fish yet the photos show them in tanks with gravel.
Well, I take almost all of my own photos for this site and I have to get the photos where ever I can. These fish were photographed in a shop (with permission) so I had no control over their care.