Franco Banfi / Bulb tentacle sea anemone (Entacmaea quadricolor) close up detail, Maldives, Indian Ocean

David Fleetham / Gorgonian coral (Gorganacea) with polyps extended for feeding, Savusavu, Fiji.

Juergen Freund / Blue buttons {Porpita porpita} various color morphs, Indo-pacific

Juergen Freund / Blue button {Porpita porpita} Indo-pacific

Juergen Freund / Pink squat lobster (Lauriea siagiani) on Barrel sponge, Indo-Pacific

Juergen Freund / Blue button {Porpita porpita} Indo-pacific

Juergen Freund / Mushroom coral (Fungia genus), Queensland, Australia

Juergen Freund / Abstract view of sea slug / Nudibranch {Nudibranchia} on various corals, Indo-Pacific

Flip Nicklin / Underwater sunlight reflections

Juergen Freund / Close up of eye of pufferfish {Arothron sp} Indo Pacific

Hiroya Minakuchi / Amazon River Dolphin (Inia geoffrensis) view of the surface of the Amazon River, Rio Negro, Brazil

Roberto Rinaldi / Coral (Mycedium sp) fluorescence at night, Red Sea

Roberto Rinaldi / Coral (Mycedium sp) fluorescence at night, captured using electronic strobes, Red Sea.

Roberto Rinaldi / Coral (Mycedium sp) fluorescence at night, captured using electronic strobes, Red Sea.

Roberto Rinaldi / Coral (Fungia sp) at night. This image is photographed with a normal camera as a comparison with image 8118531, Red Sea.

Roberto Rinaldi / A close-up of a part of hard coral, the green comes from the symbiotic zooxanthellae algae, Great Barrier Reef, Australia

Roberto Rinaldi / Close-up of lips of Giant Clam (Tridacna gigas), Palau, Micronesia.

Roberto Rinaldi / Coral (Favia sp) fluorescence at night. This image was taken using the normal technique as a comparison against image 118539 which was shot using strobes, Red Sea

Roberto Rinaldi / Fishing net underwater.

Roberto Rinaldi / Coral (Fungia sp) fluorescence at night, captured using very powerful electronic strobes. This image is a comparison with image 8118530, Red Sea

Roberto Rinaldi / Coral (Fungia sp) fluorescence at night, captured using a very powerful electronic strobe. The black part is a portion of the animal which is dead, Red Sea

Roberto Rinaldi / Coral (Mussidae) fluorescence at night, captured using very powerful electronic strobes, Red Sea

Roberto Rinaldi / Coral (Favia sp) fluorescence at night, captured using very powerful electronic strobes, Red Sea. Taken for comparison with number 118538, which was taken using the normal technique.