The bubble-eye goldfish variety, native to China and Japan, is characterised by upward-facing eyes surrounded by large, fluid-filled sacs. These sacs jiggle as the bubble-eye swims. They can easily be punctured by sharp aquarium ornaments (terracotta pagodas, decorative amphoras), so care must be taken in selecting the decor for the tank. The bubble-eye can’t compete for food with more agile and fast-moving goldfish due to its poor eyesight. Poor bubble-eye!