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A cleaner wrasse is a fish that obtains food by removing material, including external parasites, from other fish. Such interactions make benefits, conflicts and partner choice observable in a natural social setting. Labroides dimidiatus is a widely studied example.

Labroides dimidiatus is the bluestreak cleaner wrasse. Its interactions with visiting client fish are used to study cooperation and conflict, because feeding opportunities and the client’s benefit need not always coincide.