This is a Masked? Goby about 1 1/2 inches. Photo by Rod 22 Mar 04 in about
30 feet water.
Location was Christmas Tree-French Reef;
Key Largo.
Coryphopterus personatus/hyalinus
Bright orange to translucent; Series of small white rectangles on lateral line;
I reduced picture size so they would be visible on your screen. Just click on thumbnail for 6 x 4 picture, and name for 10 x 8 full size picture or more info.Picture above does not show gold markings of pictures in books below. It also shows no mask, so is probably the Glass Goby (C. hyalinus)
Size: 3/4- 1 1/4 inches; max 1 1/2 inches;
Audubon Field Guide; page 619; plate 355;
Reef Fish ID 3rd ed.; page 280-281; plate 281;