MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Tomato cod (Cephalopholis sonnerati) having its gills cleaned by a cleaner shrimp. This is a symbiotic (mutually beneficial) relationship: the shrimp removes harmful parasites from the fish's body and in return can feed unharmed. The tomato cod is a type of grouper found in the tropical waters of the Indo-Pacific region. Photographed off Mabul Island, Malaysia.
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