The Bubble Eye normally has an evenly curved back that lacks a dorsal fin. The pair of large pouches of skin attached under its eyes jiggle as it swims. Bubble Eyes have metallic scales and they are similar to the celestial eye goldfish. The eyes of the Bubble Eye goldfish are normal in the young fry, but will start to develop eye bladders three months after hatching. Like ranchu, the bubble eye goldfish lacks in dorsal fin and has a double tail. They normally grow up to 6 to 8 inches in length.
Bubble Eyes come in many color patterns such as red, red-and-white, black, gold and calico.
Bubble eyes are inexpensive and they are very commonly seen as other goldfish. It is not recommended for beginners because the eye sacs can get punctured if it is not handled carefully. This goldfish requires a special aquatic environment because they are relatively poor swimmers due to their impaired vision, and cannot compete with more active goldfish. So there is a chance of losing their food to other active fishes. Their “bubbles” can be easily sucked into the filter intake. These bladder-like swellings can also be easily damaged by any sharp-edged rocks and tank decorations. Bubble eye and fancy goldfish varieties may remain healthy up to 30 °C (86 °F).