Why do dead fish float upside down in water?

       Like all living creatures, gases build up inside a fish's body when it dies, and this keeps it afloat in the water. These gases collect mainly in the abdominal cavity, which is on the underside of the fish. When this happens, the lighter, gas-filled abdomen becomes buoyant and the more compact back forms the center of gravity, with the result that the fish is turned upside down. It is only when decomposition is further advanced that the gases are released, and the fish sinks.

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