Fish glue is made by boiling down fish swim bladders.
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鳔 is the gas-filled organ that lets a fish stay neutrally buoyant. Common words: 鱼鳔 yúbiào (fish swim bladder) and 鳔胶 biàojiāo, a traditional strong glue boiled from dried swim bladders.
The fish radical 鱼 on the left marks 鳔 as something belonging to a fish — here an internal organ — grouping it with fish-anatomy and fish-name characters.
