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Credit: Sandra J. Raredon, Division of Fishes, National Museum of Natural History, Smithsonian Institution.
A travelling Smithsonian exhibit set to debut in New Haven, Conn. in July reveals the insides of fish in a whole new light. This is a moray eel, a major predator on coral reefs. The image reveals a second set of "jaws" in the eel's throat. These are the gill arches, which support the eel's gills. All fish have gill arches.