Caribbean Flashlight Fish
Kryptophanaron alfredi

1/60s at f16, ASA 64, Ektachrome 64, Nikonos II w 28mm and close up lens, master flash and slave flash for fill

"Flashlight Fish." Wikipedia, the free encyclopedia. Flashlight fish are named for their large bioluminescent organs. These are located beneath the eyes and contain luminous bacteria. Two methods are used by different species for controlling light emission, either a shutter-like lid is raised over the organ or the organ is turned downward into a pouch. The light is used for predator avoidance, to attract prey, and for communication.
Salt River Canyon, 100 feet, St. Croix, U.S. Virgin Islands