Just fanning aroundGeorgette Douwma/naturepl.comBy Vedrana SimicevicThe fin fanning of damselfish in the Red Sea helps boost the rate of photosynthesis of the algae that live inside corals. We already knew that the damselfish (Dascyllus marginatus) lives in symbiosis with the coral Stylophora pistillata. The fish use coral branches as shelters and...