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clean·er fish
/ˈklēnər fiSH/noun
- 1. a small fish, especially a striped wrasse, that is permitted to remove parasites from the skin, gills, and mouth of larger fishes, to their mutual benefit.
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noun
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Cleaner fish are fish that show a specialist feeding strategy by providing a service to other species, referred to as clients, by removing dead skin, ectoparasites, and infected tissue from the surface or gill chambers. This example of cleaning symbiosis represents mutualism and cooperation behaviour, an ecological interaction that benefits both parties involved. However, the cleaner fish may cons... Wikipedia