Three Degrees Of Japan's Seas

Hunting for morsels of plankton, a school of spadefish hovers near the ocean surface off Japan's subtropical Bonin Islands. The turquoise color is natural late in the afternoon, when the red rays of the setting sun spread out and grow weak. The waters off the coast of Japan vary from frigid to temperate to tropical. The marine life is uniformly extraordinary. ( © Brian Skerry/National Geographic )