It looks to be a school of angelfish.
"Caribbee"
Thomas Hoover
Careful, Katy, or you'll frighten the angelfish.
"Caribbee"
Thomas Hoover
The fish had the hues of sunsets on their scales, and the most beautiful, the angelfish, were three for a penny, while the uglier, more edible ones, were sixpence each.
"Jungle Peace"
William Beebe