Scientific name: 
Chaetodon capistratus
Distinctive features: 
Black spot, ringed in white, on rear body near upper base of tail.
Size: 
3-4 in. max. 6 in
Silver-gray. Marked with numerous dark, thin lines that radiate at a diagonal from midbody; black bar on hear runs across eye; yellowish submarginal band on rear dorsal, tail and anal fins.