The Ocean Art Underwater Photo Competition, organized by the Underwater Photography Guide, announces its 2013 winners. Here, a triggerfish is being cleaned at a wreck in the Red Sea.
Two kelp crabs defend their meal in waters off of Seattle.
This scene might look intimate, but these fish are actually fighting. Two blennies lock jaws near Blue Heron Bridge in Riviera Beach, Fla.
Two green sea turtles meet up at Tenerife, the largest of the seven Canary Islands.
Two manatee calves nurse in a family moment snapped at Crystal River, Fla.
This sea lion portrait was captured in Southern Australia.
A bait ball refers to a naturally occurring fish swarm. This diver in the Canary Islands certainly had a good view of one.
Blacktip sharks are active at dusk, as you can see in this shot of a shark near KwaZulu Natal, a province of South Africa.
Photographer Vanessa Mignon went eye-to-eye with a humpback whale near Vava’u, Tonga.
Water appears to be spinning around this Caribbean reef shark, photographed in the Bahamas.
Dolphins will sometimes eat jellyfish, but this enormous one doesn't appear to be on the dolphin’s menu.
The photographer moved in for a close-up of this squid in the waters off of northeast Taiwan.
The flower-like hydroid is actually a small marine predator related to jellyfish. Tiny crustaceans known as amphipods collect around the hydroid. They were photographed off Grand Cayman.
This pipefish makes contact with coral near Moalboal, Philippines.
Juveniles of many marine species stick together, like these flying fish. They were captured near the water’s surface off northeast Taiwan.
The pink of the algae really pops over a school of parrotfish in the waters off of Socorro Island.
"The tiny octopus stopped in my lights, intently studying me as I studied it," said photographer Jeffrey Millsen, "and then began to expressively posture and react to my every move."
This grey seal was timid at first, but couldn’t resist playing with the diver’s drysuit glove. The moment was captured in the waters off of Norway.
Red hues often signify danger in nature. This devil scorpionfish seems to be basking in its power, hanging out at Lembeh Strait, Indonesia.
A man takes his child for a first dip.