Searching for snapper fish

MIT/WHOI Joint Program graduate student Kelton McMahon (front) and WHOI research assistant Leah Houghton enter a large underwater cavern on a Red Sea coral reef off Alith, Saudi Arabia in search of adult snapper fish. By analyzing fish otoliths, or ear bones, McMahon can discern where fish spent their formative juvenile years and help identify critical areas that should be protected to prevent the demise of coral reef fish populations. (Photo by Michael Berumen, Woods Hole Oceanographic Institution)