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When certain fish are brought up from depths greater than 40 feet too quickly, their swim bladders, which normally control buoyancy, can overinflate from rapid depressurization. Burping is a technique used on a fish with an overinflated swim bladder. The fish is massaged in the belly region in an attempt to release the excess air in the swim bladder. Puncturing involves using a needle or ice pick to poke a hole in the fish's exposed swim bladder. Both of these techniques are currently being advocated in other parts of the country. However, if the procedure is not carried out correctly, more damage than good may be done to the fish.
That was my first thought too.. swim bladder.. I've seen it a few times.. Does it ever swim upright?
This is going to sound strange.. but I had an oscar who had a swim bladder issue.. He was old and very well trained, so I tried holding him in my palm (well part of him) and rubbed his belly.. And I fed him peas. This was an old trick my grandfather taught me when I was a kid and would help him breeding his fancy goldfish. feed him peas one at a time until he isn't taking more, and repeat the next day.. should clear up in a couple of days.. if it doesn't then it's probably not swim bladder and he's just a weirdo.