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Chaetodon lunulatus
It has a yellowish tinge with oblique purple-blue stripes. A yellow-edged black bar passes through the eye, and a narrow black line crosses the cheek behind the eye. The red-orange anal fin has a yellow-edged black band along its base.
Bay
Awesome pic. Chaetodon trifasciatus is an Indian Ocean fish. Close relative, but the one we have in Hawaii is actually Chaetodon lunulatus. More info can be found here:
http://en.wikipedia.org/wiki/Melon_butte...