+The swim bladder is a gas-filled internal organ found in most [bony fish](/wiki/bony_fish), acting as a hydrostatic device. It allows the fish to maintain neutral [buoyancy](/wiki/buoyancy) at various depths without expending energy, a silent marvel of aquatic life.
+## See also
+- [Fish Anatomy](/wiki/fish_anatomy)
+- [Gas Exchange](/wiki/gas_exchange)
+- [Deep Sea](/wiki/deep_sea)
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