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By my own understanding when a fish breathes in oxygen through the gills from the water it goes into its lungs, just like a human respiratory system.

So surely if a fish dies it will still have air inside of it. Air as we know is less dense compared with water and anything filled with air in water; tends to rise.

If the lungs are on he under side of a fish surely this would make the fish tend to roll onto its back and be 'upside-down'

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13y ago

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