Arabian Picassofish
Composite image of an Arabian picassofish (Rhinecanthus assasi), or assasi triggerfish, swimming past soft corals (order Alcyonacea). This Arabian picassofish has its dorsal spine raised. This can be used as a warning to deter predators or to keep itself fixed in small spaces to avoid predation. Photographed in the Red Sea, Egypt., by GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY
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