Masked rabbitfish (Siganus puellus). This fish is found in the Indo-West Pacific region in shallow coral reef areas, lagoons and particularly areas with plenty of Acropora coral. Adults are more often seen in pairs and feed mainly on algae, tunicates, and sponges. They can grow up to around 30cm in length and can attack with painful stings. Photographed in Lembeh Strait, North Sulawesi, Indonesia.