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A Crown of Thorns starfish (Acanthaster planci), on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia
A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia
A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia
A tropical island fringing reef, just offshore from Havodda island, Gaafu Dhaalu atoll, in The Maldives, Indian Ocean, Asia
Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia
Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.
A brightly colored soft coral adorns prop roots in a blue water mangrove forest in Raja Ampat, Indonesia.
A blue sea star, Linkia laevigata, clings to a healthy coral reef in Raja Ampat, Indonesia.
Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Nuestra Senora del Carmen Chapel, Los Fundadores Park, Playa del Carmen, Quintana Roo State, Mexico
Blue ocean underwater background, Thailand
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
West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize
Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia
Sand Island off Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Walking close to the water's edge, as pristine shallow waters lap against the white coral sand of a tropical beach, Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, Maldives
Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico
Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico
The sergeant major or pintano fish(Abudefduf saxatilis) 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
Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico
Aerial view of white coral sand of a blue lagoon at low tide, Paje, Jambiani, Zanzibar, Tanzania, East Africa, Africa
Underwater view of the reef on Pulau Lintang Island, Anambas Archipelago, Indonesia, Southeast Asia, Asia
Bulog Dos Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia
Coral Beach at An Dorneil, Loch Dunvegan, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Coral Beach at An Dorneil, Loch Dunvegan, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
An adult blue girdle angelfish (Pomacanthus navarchus), off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia
Adult blue-green chromis (Chromis virdis), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia
A juvenile blue demoiselle (Chrysiptera cyanea), on the reef off Kawe Island, Raja Ampat, Indonesia, Southeast Asia
Adult blue-green chromis (Chromis virdis), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia
An adult blue girdle angelfish (Pomacanthus navarchus), off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia
Turquoise coral reef meeting the blue Indian Ocean, aerial view by drone, Ile Aux Cerfs, Flacq district, Mauritius, Indian Ocean, Africa
Lighthouse Reef, Belize, Central America
French Polynesia, Tuamotu Archipelago, Manihi At Oll, The Lagoon, Coral Reefs At Fore
Blue sea star (Linckia laevigata) shares the reef with sponges, feather stars and coral, Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia
Split image of blue coral (Heliopora coerulea) and island, Rongelap, Marshall Islands, Micronesia, Pacific
Split image of pristine coral reef and island, Rongelap, Marshall Islands, Micronesia, Pacific
Reticulated dascyllus (Dascyllus reticulatus) hovering over coral, Rongelap, Marshall Islands, Micronesia, Pacific
Blue sea star (Linckia laevigata) and orange cup coral (Tubastrea faulkneri) at night, West Escarceo, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia
Blue-green chromis (Chromis viridis), Rongelap, Marshall Islands, Micronesia, Pacific
Mast encrusted with soft coral (Dendronephthya sp.), Shinkoku Maru, Truk lagoon, Chuuk, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific
Blue sea star (Linckia laevigata) shares the reef with sponges, feather stars, and coral, Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia
Split image of blue coral (Heliopora coerulea) and Jaboan, Rongelap, Marshall Islands, Micronesia, Pacific
Blue coral (Heliopora coerulea), Namu atoll, Marshall Islands, Pacific
Divers explore the main deck, Fujikawa Maru shipwreck, Truk lagoon, Chuuk, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific
Painted Angelfish (Pomacanthus xanthometopon), superb profile of fish swimming diagonally showing all markings, Sipadan, Mabul,
Yellow Tube Sponge (Aplysina fistularis) nice group of yellow sponges against blue background, Little Cayman Island, Cayman Island, Caribbean
Deepwater gorgonian sea fan (Iciligorgia schrammi), Blue sea background Little Cayman Island, Cayman Islands, Caribbean
See squirt (currently unidentified). Mabul
(Flabellina exoptata) Nudibranch with outragious colour of orange and red to purple and blue tipped tentacles, Mabul, Borneo, Malaysia, South China Sea
(Nembrotha spp.), detail of nudibranch with dark blue/green skin and brilliant blue markings, Mabul, Borneo, Malaysia, South China Sea
Yellowtail Damselfish (Microspathodon chrysurus), Intermediate stage from juvenile to adult showing irridescent blue spots on body, Cayman Brac, Cayman Islands, Caribbean
Blue Parrotfish (Scarus coeruleus). Bahamas.
Colourful Nudibranch (Chromodoris wallani), very nice colourful nudibranch on indistinct background, Sipidan, Mabul, Malaysia.
Colourful Nudibranch (Chromodoris annae), superb;y coloured with yellow, orange, white, blue & black on indistinct background, Sipidan, Mabul, Malaysia.
Royal Gramma or Fairy Basslet (Gramma loreto) beautifil yellow fish with brilliant purple head, Cayman Brac, Cayman Islands, Caribbean
(Nembrotha spp.), detail of nudibranch with dark blue/green skin and brilliant blue markings, Mabul, Borneo, Malaysia, South China Sea
Gorgonians.
Chromodoris Nudibranch (Chromodoris spp.) superb colours of silver blue, white and orange over indistinct base, Mabul, Borneo, Malaysia, South China Sea
(Nembrotha spp.), detail of nudibranch with dark blue/green skin and brilliant blue markings, Mabul, Borneo, Malaysia, South China Sea
Crinoid (Oxycomantus bennetti), large individuals on edge of coral with blue water behind, Sipadan, Mabul, Borneo, Malaysia, South China Sea
Colourful Nudibranch Chromodoris magnifica), orange, black & white coloured nudibranch, very clear view from above, Sipidan, Mabul, Malaysia.
Queen Angelfish (Holacanthus ciliaris). Brightly coloured adult swimming against a coral background, Cozumel, Mexico, Caribbean
(Chromodoris annae) Nudibranch with brilliant blue and yellow skirt and orange tentacles, Mabul, Borneo, Malaysia, South China Sea
Gorgonian Sea Fan - Annella reticulata (Supergorgia reticulata), Sipadan, Sabah, Malaysia, Borneo, South-east Asia
Gorgonian Sea Fan - Annella reticulata (Supergorgia reticulata), Sipadan, Sabah, Malaysia, Borneo, South-east Asia
Diver looks down on blue seastar (Linkia laevigata) on a barrel sponge (Xestospongia sp.) Komodo, Indonesia, Pacific Ocean.
Mushroom coral, Fungia sp., displaying fluorescence. Some corals have pigments which fluoresce under UV or blue wavelengths of light. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean.
Blue seastar, Linckia laevigata, hanging on a boulder coral, Porites sp. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.
Hard coral (Acropora digitifera ) and shoal of Pale-blue damsel fish ( Chrysiptera glauca ), Sipadan, Sabah, Malaysia, Borneo, South-east Asia
Coral Fields Blue Coral Bommies, (Heliopora sp.) and divers. Gorontalo, Sulawesi, Indonesia. (rr)
Coral Fields Blue Coral Bommies, (Heliopora sp.) and local fishing boat. Gorontalo, Sulawesi, Indonesia. (rr)
Male Ribbon Eels (Rhinomuraena quaesita). Gorontalo, Sulawesi, Indonesia
Sea Star (Linckia laevigata). Borneo, Malaysia (RR)
Shoal of Lunar Fusiliers & Scissor-tailed Fusiliers (Caesio cuning & Caesio caerulaurea) Barracuda Point, Sipadan Island, Borneo, Malaysia
(RR)
Soft Coral growing on the hull of the 'Blue Plunder' wreck - Nassau,Bahamas
Mating Hamlet fish. Caymans.
Diver and Sea Star (Linckia laevigata). Borneo, Malaysia (RR)
Bigeye (Priacanthus hamrur). Sipadan Island, Malaysia (RR)
Mating Hamlet fish. Caymans.
Pederson Shrimp (Periclimes pedersoni) in Anemone for protection at night. Cayman Islands.
Queen angelfish (Holocanthus ciliaris). Caribbean