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In this photo is the adult. The Yellow boxfish, Ostracion cubicus, is a boxfish of the genus Ostracion, and can be found in reefs throughout the Pacific Ocean and Indian Ocean as well as the south eastern Atlantic Ocean. It reaches a maximum length of 45 cm. As the name suggests, it is box shaped. When juvenile, it is very bright yellow in color. See my spotting: http://www.projectnoah.org/spottings/628... As it ages, the brightness fades and very old specimens will have blue-grey coloration with the faded yellow. It feeds mainly on algae, but will also feed on sponges, crustaceans and mollusks.