Triggerfish, coloured X-ray. Triggerfish (family Balistidae) take their name from their sharp dorsal fin (pink/white, upper left). This modified fin can be locked in the erect position (as seen) to anchor the fish in crevices in rocks or coral. Triggerfish have a bird-like beak (white, centre left), which is used to crack open the shells of their prey. They feed predominantly on hard-shelled animals such as sea urchins, molluscs and crustaceans. There are many species of triggerfish, which are distributed in warm seas throughout the world.. Stunning Photo Gifts From Science Photo Library
