Why are reef fish so colorful, like butterflies? It is because the water in Red Sea is ever transparent. The fish see each other from far distance. Unlike a river, here in Red Sea fish body coloring does matter, like coloring does matter for field butterflies. That is why the evolution created coral butterfly-fish .
Underwater photos at this site are taken without a scuba. I used only a diving mask and a snorkel (a specially curved plastic respiratory tube). The photos were made by digital cameras - Nikon cp880, Fuji f30 .