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It is a mutant of Red Egg-fish and extremely rare and precious among goldfish. It is in a similar shape as common Egg-fish with the only difference of two half-transparent bulbs full of liquid under eyeballs and protruding out of eye sockets, hence the name. Such bulbs can either be small hard ones or developed and big ones extruding eyeballs half skyward. The bulb membrane is very thin with clear line-shaped capillary tubes. When it swims, these two bulbs will wave around like two big lanterns, which look very charming. So far the varieties having appeared include Red and White Bubble-eye, White Bubble-eye, Blue Bubble-eye, and Transparent Bubble-eye, etc., and those appearing in recent years enjoy much richer colors and hence are more loved.
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