Mandarinfish (2 inches) pair in mating ritual - I was extremely fortunate to capture the moment of the female releasing her eggs.  This ritual, which takes place only at dusk,  lasts only about 5 seconds, as the two pair up, rise above coral rubble together, and release eggs and sperm into the water simultaneously - immediately dashing back down into the rubble thereafter.  This photo won second place in the macro category of the 2009 Underwater Images competition.