These fish may feel pleasure while being groomed by other fish

August 25, 2025
A threadfin butterflyfish swims though the Red Sea. A recent experiment suggests that these fish may experience something like pleasure.

An experiment with threadfin butterflyfish finds that these fish may experience pleasure while being cleaned by bluestreak cleaner wrasse — suggesting this capacity goes far back in animal evolution.

(Image credit: Reinhard Dirscherl)



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