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Curled opercula are a morbid state for goldfish. The operculum edge grows curled outside with part branchial filaments exposed outside, which looks like a wound. However, this has no impact on its breathing, for the variation is controlled by genetic factor. Due to long-term adaptation, this variety seems to have better resistance to disease than those with normal opercula. It incorporates both variations of Oranda and Curled Opercula, and those with higher sac and similar turning angle for the left and right opercula are regarded as high quality.
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