Swim bladder, Porcupine fish
A dried inflated bilobed swim bladder from a porcupine fish species. It is a golden colour with darker markings. The bladder is hollow and light.
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The swim bladder is a organ found in fish to help them with control buoyancy and balance by inflating and deflating it. Most swim bladders are soft and decay quickly but porcupine fish bladders survive after death and are often washed up on shore.
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