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Mouth problems in goldfish

Goldfish develop various problems in and around their mouth. They commonly forage by sucking sand or gravel into their mouths in the search for food particles. Occasionally, large pieces of gravel get stuck, but in many cases, these are expelled unaided by the fish after several minutes. This is most common in goldfish living in indoor aquaria where they are more closely observed. Bacterial infection of the mouth is less common and often related to poor water quality. In contrast to koi, virus infections and tumours around the mouth are uncommon in goldfish.

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