Goldfish has a white bulge between in front of anal fin.
i have a 8 x 10 foot three feet deep pond, one of the gold fish got sucked into the filter and got stuck about a month ago, we noticed a week or two after he grew a bulge under his tail by his butt. he just lies in the pond upsidedown with his big white bulge butt sticking up he looks dead but then he stats trying to flip right side up. Did he get injured in the filter and now its swelling or is it something else?
the person at petsmart said it may have a damaged vertebrae.