Fish ID: Citron Butterflyfish

Butterflyfish citron nsw
Family Butterflyfish (CHAETODONTIDAE)
species Chaetodo citrinellus
size up to 11cm
locality Rocks and reef
behaviour Solitary or in pairs
range Throughout the Indian Ocean to the Pacific

About the colour of a lemon-sorbet, covered with dark dots in neat lines.  A black bar down the face across the eye.