The yellow boxfish (Ostracion cubicus) is a species of boxfish found in reefs throughout the Pacific and Indian oceans as well as the south eastern Atlantic Ocean. The juveniles of this species are bright yellow in color. As they mature, their color faded to a more blue-gray appearance. Boxfishes are characterized by their nearly square or box-like shapes. When threatened, this species can release a poison into the water. It grows to a maximum size of 18 inches (46 cm) and feeds mainly on algae, but will also eat sponges, crustaceans and mollusks.