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It could be because he/she has over-eaten or because he/she has dropsy. If only the "chest" is swollen, he/she has probably eaten too much. Don't feed him/her for a day or two, or give him/her a small piece of a pea (put a frozen pea in a little water and microwave for 10-15 seconds, then cool it down and cut it up, no skin). Start feeding him/her a little less at meal times.

If the whole fish is swollen, and the scales are sticking out (a little like a pinecone), it is dropsy. Dropsy can be caused by many things, including bacteria. If it is bacterial, it can be treated. Go to the pet store and look for fish medication. Good ones to look for are Maracyn or Maracyn-Two, but they are not the only medicines out there. Read the label of each brand carefully to see what will treat dropsy the best.

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If it's a female, it could simply be that she's gravid (filled with eggs).

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12y ago

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