Photographer: Paul Osmond
(see this users gallery)
A bright white colored Leaf Scorpionfish (Taenianotus triacanthus) perched on an outcropping on the wreck of the USS Liberty in Tulamben Bay in Bali, Indonesia.
These thin bodied fish wave back in forth in the current and thus move like a leaf. Like all other scorpionfish, these are ambush predators and they use their appearance to literally hide in plain site waiting for prey to swim or move close by. They are extremely difficult to see, even when in plain sight.