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A snorkeler with a large school of bigeye trevally (Caranx sexfasciatus) in deep water near Cabo Pulmo, Baja California Sur, Mexico, North America

Colourful reef fishes on the reef at Tumakohua Pass, Fakarava Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

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

Group of spotted eagle rays (Aetobatis narinari), Oahu, Hawaii, United States of America, Pacific, North America

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

A great barracuda (Sphyraena barracuda) comes close to the reef to be cleaned by a cleaner wrasse, Hawaii, United States of America, Pacific, North America

Schooling threadfin butterflyfish (Chaetodon auriga), in Rarotonga Lagoon, The Cook Islands, South Pacific, Pacific

A longjaw squirrelfish (Sargocentron spiniferum), and a school of bigscale soldierfish (Myripristis berndti), Hawaii, United States of America, Pacific, North America

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

An inflated guineafowl pufferfish (Arothron meleagris), on a drop off in Fiji, South Pacific, Pacific

Almaco jack (Seriola rivoliana), in the pen at a fish farm off The Big Island, Hawaii, United States of America, Pacific, North America

A nurse shark (Ginglymostoma cirratum) pictured with a school of juvenile jacks. Bahamas, Central America

A female blacktip reef shark (Carcharhinus melanopterus), off the island of Yap, Micronesia, Pacific

Giant trevally (Caranx ignobilis) shoal, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Bigeye emperor (Monotaxis grandoculis), Maui, Hawaii, United States of America, Pacific, North America

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

A snorkeler with a large school of bigeye trevally (Caranx sexfasciatus) in deep water near Cabo Pulmo, Baja California Sur, Mexico, North America

Whale shark (Rhincodon typus) with a shoal of red fish evading predation, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Glassfish (Parapriacanthus ransonneti) shoal, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Adult spinetail mobula (Mobula japanica) leaping, Isla Espiritu Santo, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Adult Northern (Steller) sea lion (Eumetopias jubatus) bull looking for fish scraps from fishermen in Petersburg, Southeastern Alaska, United States of America, North America

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

View of a male pink salmon, Oncorhynchus gorbuscha, in the Indian River spawning near Sitka, Alaska, United States of America

Juvenile whale shark (Rhincodon typus) with a common remora attached in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Adult pink salmon, Oncorhynchus gorbuscha, returning to the Indian River to spawn near Sitka, Alaska, United States of America

Whale shark (Rhincodon typus) with shoal of fish on the surface), Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Water lilies pond with many koi carp, Jardin Botanique de Deshaies, botanic garden, Deshaies, Basse Terre, Guadeloupe, Leeward Islands, West Indies, Caribbean, Central America

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Underwater image of the inner lagoon of Apataki coral atoll, Palliser Islands, Tuamotus, French Polynesia, South Pacific, Pacific

Adult spinetail mobula (Mobula japanica) leaping, Isla Espiritu Santo, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Colorful reef fish in the inner lagoon at Toau Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Orbicular batfish (Platax orbicularis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Yellow-dotted trevally (Carangoides fulvoguttatus) shoal, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Tropical fish under the waves along the tropical coral reef, Le Morne Brabant, Black River district, Mauritius, Indian Ocean, Africa

Tropical fish swimming on coral reef in the tropical lagoon, Le Morne Brabant, Black River district, Mauritius, Indian Ocean, Africa

Baby black-tip reef shark being surrounded by a school of silver sprats in a shallow lagoon, Maldives, Indian Ocean, Asia

Tufted Puffin (Fratercula cirrhata) with fish in its beak, Homer, Alaska, United States of America, North America

A broadclub cuttlefish (Sepia latimanus) lays eggs in a coral colony in Komodo National Park, Indonesia.

A school of big-eye jacks (Caranx sexfasciatus) above a coral reef in the Solomon Islands. This region is known for its healthy fish populations.

Blacktip reef sharks swim just under the surface in the Solomon Islands. This beautiful Melanesian region is known for its spectacular reefs and high marine biodiversity.

A large reef manta ray (Mobula alfredi) swims through clear water in Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

A Caribbean electric ray (Narcine bancroftii) lays on the sandy seafloor of Turneffe Atoll off the coast of Belize in the Caribbean Sea. This ray can generate strong electric discharges used to defend themselves or to stun prey.

A pair of spotted eagle rays (Aetobatus narinari) swim over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A pair of robust ghost pipefish (Solenostomus cyanopterus) hover above the seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A lionfish (Pterois volitans) displays its venomous spines in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A spine-cheeked anemonefish (Premnas biaculeatus) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia.

A lionfish (Pterois volitans) swims along the edge of a beautiful reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A massive school of bigeye trevally (Caranx sexfasciatus) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

A large black-blotched stingray (Taeniura meyeni) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A school of juvenile striped eel catfish (Plotosus lineatus) swims over the seafloor in Komodo National Park, Indonesia.

An ornate ghost pipefish (Solenostomus paradoxus) hovers above a coral reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

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.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a beautiful set of corals growing near Alor in the Lesser Sunda Islands of Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim in a strong current near Alor in the Lesser Sunda Islands of Indonesia.

A blue line grouper (Cephalopholis formosa) swims on a reef in the Lesser Sunda Islands of Indonesia.