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  • Hook and Hardy Reef in the central Great Barrier Reef complex.  The reefs are seperated by a deep channel.  Diveboats typically anchor here.
    18070-D.jpg
  • The Great Barrier Reef! Hardy Reef (left) and hook Reef (right) are parts of Great Barrier Reefs' mddle secrion and is found off Whitsunday islands and the town Macay in central Queensland.
    18353.jpg
  • Hardy Reef is part of Great Barrier Reefs' mddle secrion and is found off Whitsunday islands and the town Macay in central Queensland.
    18347.jpg
  • Fishery settlement on a small islet off Labuan Bajo, Nussa Tenggara Timur, Indonesia. Here people live on and of the coral reefs.
    18105-D.jpg
  • Border island, off Macay, with fringing coral reefs.
    18051-D.jpg
  • Fringing reefs on the "Coral Coast" on the southern side of Viti Levu, Fiji.
    18520.jpg
  • Bird's Island with a shallow fringing reef off the coast of northerbn Viti Levu, Fiji
    18229.jpg
  • Reef structures, live corals (brown), shallow sand flats (light green) and deeper sand flatss (blue) in Hardy Reef, central Great Barrier Reef section.
    18060-D.jpg
  • Part of Hardy Reef in the central GBR-section off Whitsunday Island as seen from the air. In the centre is the small patch-reef known as "Heart Reef" - obvious why.
    18059-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18102-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18104-D.jpg
  • Dive boats and big catamarans bring tourists to Hardy Reef off Whitsunday island for skin- and SCUBA-diving on the feef flat.  The boats are anchored in the channel between Hardy- and Hook Reef.
    18068-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18099-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18061-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18066-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18103-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18577.jpg
  • Pair of the Giant Morey Eel (Gymnothorax javanicus) that can reach 2.5 meters in length.  Photo from Great Barrier Reef, Australia.
    2012.jpg
  • Social feeding groups of the "Powder Blue Tang", Acanthurus leucosternon, on a shallow reef flat in the Maldives.
    2908.jpg
  • The Giant Morey Eel (Gymnothorax javanicus) can reach 2.5 meters in length.  Photo from Great Barrier Reef, Australia.
    35291.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18584.jpg
  • A lage underwater cave at "Latheef Reef, Kuredu in the Maldives.  The cave is full of soft corals and fishes.
    18039.jpg
  • A lage underwater cave at "Latheef Reef, Kuredu in the Maldives.  The cave is full of soft corals and fishes.
    18171.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18552.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18283.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18324.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18551.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18585.jpg
  • Green Sea Turtle, Chelonia mydas, in a sea grass bed at Green Island, northern Great Barrier Reef, Australia.
    3018.jpg
  • Moorish Idol, Zanclus cornutus, swimming under an overhanging reef wall in the Maldives.
    35553.jpg
  • Diving a beautiful cave on "Nakohlu Giri" a reef site close to the island of Kuredu, the Maldives
    18492.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18317.jpg
  • A beautiful cave on "Nakohlu Giri" a reef site close to the island of Kuredu, the Maldives
    18489A.jpg
  • A pair of Orange-spotted Filefish (Oxymonacanthus longirostris) in a shallow reef in the Maldives
    35601.jpg
  • Bigeye Trevally (Caranx sexfasciatus) from Watanabe Bommie, The Coral Sea.
    2849.jpg
  • Swimming with Bigeye Trevally (Caranx sexfasciatus) from Watanabe Bommie, The Coral Sea.
    2014.jpg
  • Bigeye Trevally (Caranx sexfasciatus) from Watanabe Bommie, The Coral Sea.
    35550.jpg
  • Bigeye Trevally (Caranx sexfasciatus) from Watanabe Bommie, The Coral Sea.
    35545.jpg
  • Green Sea Turtle, (Chelonia mydas) from the Maldives.
    3004.jpg
  • Green Sea Turtle, (Chelonia mydas) from the Maldives.
    3012.jpg
  • A Frogfish (Antennarius sp.) is fishing with its illicium.  When a prey is attrached the fish opens its mouth and such in the victime within a fraction of a second.
    35111-D.jpg
  • Sea spider from family Ammotheidae (Cilunculus sp. or Nymphopsis sp.) photographed at Bunaken, North Sulawesi, Indonesia.
    118021.jpg
  • Sohal of Damselfishes (Blue Chromis, Chromis sp.) gathering around a branching coral (Acropora sp.).
    18377A.jpg
  • Barrier Reef Clownfish (Amphiprion akindynos) from Flinders reefs, the Coral Sea.
    2497.jpg
  • Pacific reef egret (Egretta sacra, light morph)  from Komodo Island, Indonesia.
    45001-D.jpg
  • Pacific reef egret (Egretta sacra, dark morph)  from Amami Oshima, southern Japan.
    45466-D.jpg
  • Pacific reef egret (Egretta sacra, dark morph)  from Amami Oshima, southern Japan.
    45465-D.jpg
  • Pacific reef egret (Egretta sacra, dark morph)  feeding on a beach at Amami Oshima, southern Japan.
    45468-D.jpg
  • Pacific reef egret (Egretta sacra, dark morph)  feeding on a beach at Amami Oshima, southern Japan.
    45467-D.jpg
  • Hawaiian reef lobtser (Enoplometopus occidentalis).
    8412-D.jpg
  • Acropora spp. growing densly on the shallow reef flat of Heron Island, Great Barrier Reef, Australia.
    5040.jpg
  • Purple reef lobster (Enoplometopus debelius).
    8133.jpg
  • Purple reef lobster (Enoplometopus debelius).
    8087.jpg
  • Red reef hermit crab (Paguristes cadenati).
    8132.jpg
  • Coral hind (Cephalopholis miniata) from Latheef Reef, Kuredu, the Maldives.
    2061.jpg
  • Ribbon worm (Baseodiscus sp.?) from Suva Reef, Fiji.
    6164.jpg
  • Small sea-squirts of the species Trididemnum miniatummolle growing on a larger sea-squirt (Polycarpa sp.) photographed at Ribbin Reef #9, Great B
    10027.jpg
  • Moorish idol (Zanclus cornutus) at Latheef Reef, Kuredu, the Maldives.
    2200.jpg
  • Red reef hermit crab (Paguristes cadenati).
    8256.jpg
  • Longfin grouper (Epinephelus quoyanus) from Hook Island, Great Barrier Reef.
    2992.jpg
  • Ribbon worm (Baseodiscus sp.?) from Suva Reef, Fiji.
    6165.jpg
  • Green reef sea-squirts (Didemnum molle) and other sea-squirts from family Didemnidae at Bunaken, North Sulawesi.
    10119.jpg
  • Green reef sea-squirts (Didemnum molle) from the Maldives
    10006.jpg
  • Giant clam (Tridacna gigas) from Green Island, Great Barrier Reef, Australia.
    7328.jpg
  • Green reef sea-squirts (Didemnum molle) growing on top of another sea-squirt (Polycarpa sp.) at Bunaken, North Sulawesi.
    10117.jpg
  • Green reef sea-squirt (Didemnum molle) from the Maldives.
    10101.jpg
  • A colourful diversity of stony corals at the Great Barrier Reef. Pectinia paeonia (two colonies left), Lobophyllia sp. (center) and branching Porites cylindrica together with a pink Montipora sp.
    5586.jpg
  • Red reef hermit crab (Paguristes cadenati).
    8359.jpg
  • Cinnamon clownfish (Amphiprion melanopus) in bubble.tip anemone (Entacmea quadricolor). Photo from Flinders Reef, the Coral Sea.
    2013.jpg
  • True or Red mangrove (Rhizophora mangle) growing along the coast near Macay, of central Queensland  Australia.
    15032-D.jpg
  • Blue-legged hermit crab (Clibanarius tricolor).
    8283.jpg
  • Blue-eyed hermit crab (Calcinus laevimanus) from the Philippines.
    8257.jpg
  • Blue-eyed hermit crab (Calcinus laevimanus) from the Philippines.
    8092.jpg
  • Porites sp. forming a microatoll at Green Island, GBR, Australia.
    80112.jpg
  • Dense and impressive growth of Porites cylindrica (branching, yellow in the foreground) with Acropora sp. and Merulina sp. in the background. Photo from Bunaken, Indonesia.
    5398.jpg
  • Aerial view of mangrove forest along the coastline off Macay, Queensland, Australia
    15010-D.jpg
  • Blue-eyed hermit crab (Calcinus laevimanus) from the Philippines.
    8141.jpg
  • Clavelina robusta from Ribbon Reef, Great Barrier reef, Australia.
    10081.jpg
  • Lissoclinum patella from Ribbon Reef (Pixie Pinnacle), the Great Barrier Reef.
    10094.jpg
  • The long tentacles of the spaghetti worm Retetrebella queenslandica photographed in a reef slope in the Maldives. The worm itself is buried oin the reef rocks.
    6002.jpg
  • Sohal of Redtooth Triggerfish, Odonus niger, feeding on plancton off the reef edge in a reef in the Maldives.
    2510.jpg
  • Green reef sea-squirts (Didemnum molle) from Hook Island, Grteat Barier Reef, Australia.
    10054.jpg
  • Stony corals, mostly Acropora spp., growing at a shallow reef flat in Fiji.
    80210.jpg
  • Tube worm (Sabellastarte sp.) from a reef in the Philippines.
    6035.jpg
  • The solitary sea-squirt Polycarpa clavata from Flinders Reef, Coral Sea.
    10043.jpg
  • Ocellaris Clownfishes (Amphiprion ocellaris) among the tentacles of the host-sea anemone Heteractis crispa in a coral reef in southern Thailand.
    2941.jpg
  • Cleaner wrasse (Labroides dimidiatus) cleaning the Clarion Angelfish (Holacanthus clarionensis) in a small reef aquarium.
    35395-D.jpg
  • Gall containing the female common coral gall crab (Hapalocarcinus marsupialis) on Seriatopora hystrix, collected from an Indonbesian Reef.
    8140.jpg
  • Morgan's hermit crab (Calcinus morgani) from Great Barrier Reef, Australia
    8058.jpg
  • Golden-striped Butterflyfish (Chaetodon aureofasciatus) at Hook Island, Great Barrier Reef, Australia.
    2994.jpg
  • Pair of Black Butterflyfish (Chaetodon flavirostris) photographed at Heron Island, southern Great Barrier Reef.
    2960.jpg
  • A Black-spotted Puffer (Arothron nigropunctatus) is being cleaned by two Bluestreak Cleaner Wrasse (Labroides dimidiatus) in a reef in the Maldives.
    2947.jpg
  • Acoel, commensal flatworms of the genus Waminoa living on the stony coral Tubastraea sp. Photo from a reef in Indonesia.
    6109.jpg
  • Pseudobiceros fulgor from the Great Barrier Reef
    6041.jpg
  • Loimia medusa from Fliders Reef, the Coral Sea.
    6160.jpg
  • Christmas Tree Worm (Spirobranchus corniculatus) from Flinders Reef, the Coral Sea.
    6120.jpg
  • Tube worm (Sabellastarte sp.) from a reef in the Philippines.
    6031.jpg
  • Unidentified colonial sea squirts, probably family Didemnidae, from Flinders Reef, the Coral Sea.
    10111.jpg
  • Pycnoclavella diminuta (yellow morph) from the Great Barrier Reef, Australia.
    10059.jpg
  • Eudistoma sp. (?) from Hook Island, Whitsunday Islands, Great Barrier Reef.
    10057.jpg
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Alf J. Nilsen Natural History images

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