Photographer Brandi Irwin uses special lighting on night dives to capture otherworldly photos of sea creatures that fluoresce, including fish, coral and sea slugs.
Red and Green
A light similar to a black light plus a special camera filter bring out colors not visible to the naked eye.
Many of Irwin's photos are taken in the Caribbean, but she is planning a dive trip in Asian waters this fall.
The fluorescing anemones are among the stars of a New York Aquarium show, opening August 5, of Irwin's work.
All coiled up
An octopus peers out from the tangle of its legs. "I will come to the surface with whatever the ocean gives me," Irwin told LiveScience. "It's unpredictable down there."
A lettuce sea slug.
A bristle worm glows green. Irwin's dives take place on moonlit nights.
Two seahorses photographed by Irwin.
Stingray & Shipwreck
Sometimes black and white is more striking. Here, a stingray approaches a shipwreck.
Sunflowers of the Deep
And sometimes the colors are riotous, as with these sunflower-like anemones.