Bennett's Butterflyfish Chaetodon bennetti

Bennett's Butterflyfish, also called the Blue-lashed (the white lines sometimes looking pale blue) and the Eclipse Butterflyfish, is native to coral reefs of the Indian and Pacific Oceans from East Africa to Japan/Australia/Polynesia. The fish can grow to 18cm long. They live in pairs. Unusually for fish, butterflyfish mate for life.