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Crowd of tropical reef fish including scissortail sergeants and grunts, Solomon Islands, Pacific Ocean

Juvenile alligator in swampland (bayou) at Jean Lafitte National Historical Park and Preserve, south of New Orleans, Louisiana, USA

Sea nettle jellyfish (chrysaora fuscescens), Monterey Aquarium, California, United States of America, North America

Close-up view of a Hawksbill sea turtle next to a red sea fan on a reef in Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Underwater view of a school of silver fish swimming in a blue aquarium environment with simulated wreckage and filtered sunlight.

Clown anemonefish (Amphiprion percula), in anemone (Heteractis magnifica), Philippines, Southeast Asia, Asia

Raccoon butterflyfish (Chaetodon lunula) and saddle wrasse (Thalassoma duperrey), off the island of Lanai, Hawaii, United States of America, Pacific, North America

Close-up view of a lionfish (Pterois volitans), Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Colorful soft corals (Dendronephthya sp.) adorn the stunning reefs of southern Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

A harlequin swimming crab (Lissocarcinus laevis), lives with this sea anemone in symbiosis, Philippines, Southeast Asia, Asia

A hard coral reef along with schooling anthias and reef fish, Crystal Bay, Bali island, Indonesia, Southeast Asia, Asia

Scavenging sea stars and a humpback shrimp (Pandalus hypsinotus) working on the remains of a rock crab, Canada, North America

Diver takes off hook from Panamic Green Moray Eel, Gymnothorax castaneus, La Paz, Baja California Sur, Mexico

Alcyonaria coral with schooling anthias dominate this Fijian reef scene, Fiji, South Pacific, Pacific

A garibaldi (Hypsypops rubicundus) in a forest of giant kelp off Catalina Island, California, United States of America, North America

Close-up of clown fish and sea anemones, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

A beautiful coral reef grows near a set of limestone islands in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater view of Jellyfish Lake, a marine lake located on Eil Malk Island, Rock Islands, Palau, Micronesia, Pacific

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A hawksbill sea turtle, Eretmochelys imbricata, lays on a beautiful reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A bleached magnificent sea anemone is found on a reef off the coast of Sulawesi in Indonesia. Bleaching is usually associated with higher than normal sea temperatures.