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Quadrato di campionamento su barriera corallina

A white square survey quadrat frame rests on a branching coral reef underwater, with sunlight filtering through the surface and a sandy seafloor visible in the background.

A coral survey grid on a reef at midday, a square quadrat frame laid over branching coral with a line running off across the sand, sunlight breaking into shafts from the surface, blue water and a far drop-off, 24mm underwater housing Mostra altro

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A dense thicket of staghorn coral sits in shallow, clear turquoise water, with a large school of small blue-green fish hovering above the branches and sunlight creating shimmering patterns on the sandy lagoon floor.

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A vibrant coral reef with purple staghorn coral and ochre brain coral sits on a sandy seabed under clear, sunlit water with rippling light caustics and a school of small fish in the background.

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A split-level underwater and above-water view of a tropical reef edge at Pulau Hantu, featuring plate corals and a carpet anemone in shallow green water, with a forested islet and hazy sky visible above the waterline.

A green sea turtle swims over a vibrant coral reef under bright, dappled sunlight filtering through clear blue water.

A school of orange redfish swims among white Lophelia coral colonies on a dark, deep-sea reef illuminated by the twin spotlights of a submersible.

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Underwater view of Champagne Reef featuring volcanic gas bubbles rising from a black sand seabed surrounded by coral, sea fans, and sponges, with sunbeams filtering through the water.

A school of fish swims around the coral-encrusted mast and rigging of an underwater shipwreck, with sun rays filtering down from the surface.

A hammerhead shark swims over a sandy seabed populated by a large colony of garden eels, illuminated by slanting late afternoon sunlight.

An underwater shot of a brain coral head with a parrotfish and a school of yellow grunts swimming in murky, teal-tinted water with dappled sunlight.

A scuba diver in a black wetsuit and gloves holds a mesh bag containing a fragment of branching coral while swimming near a reef wall in deep blue-green water with sunlight filtering from the surface.

A bright flashlight beam illuminates a vibrant orange elephant-ear sponge and a diverse coral reef against a dark, sandy ocean floor at night.

Sunken ancient marble columns and a decorative capital rest on the sandy seabed in clear turquoise water, illuminated by sunlight creating caustic patterns.

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A sunken ship wreck rests on the sandy ocean floor, covered in vibrant pink and orange soft corals, with sunlight filtering through the deep blue water above.

A green sea turtle rests on a coral reef at Apo Island, surrounded by a shoal of orange anthias fish under sunlight filtering through the water.

A vibrant coral reef wall drops into the deep blue ocean, illuminated by bright sunlight filtering through the water surface.

An over-under split-level shot showing a golden-brown elkhorn coral reef underwater in the foreground and a green island hill under a blue sky with white clouds in the background.

A massive, lumpy golden-brown Porites coral colony sits on the seafloor, illuminated by sun rays filtering through the water, with a school of small blue-green fish swimming above it.

Underwater view of a Posidonia seagrass meadow with long green blades backlit by sunlight, featuring a sandy bottom with light patterns and a small school of fish swimming through the vegetation.

A school of grey reef sharks swims along a vibrant coral reef wall in deep blue water, illuminated by sun rays filtering from the surface.

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A vibrant coral reef ecosystem filled with various species of tropical fish under clear turquoise water with sun rays filtering through the surface.

A vibrant coral reef wall teeming with barrel sponges, rope corals, and small fish, illuminated by sunlight filtering through the water from the left side.

A snorkeler is silhouetted against the sunlit surface of the ocean above a vibrant coral reef teeming with small orange fish.

An aerial view of a snorkeler floating in clear turquoise water above a large brain coral formation surrounded by small tropical fish.

An old bronze cannon covered in coral and sea fans rests on the white sandy seabed of an underwater wreck site, with shafts of sunlight filtering through the blue water and a small school of silver fish swimming near the muzzle.

A sea turtle swims past a vibrant coral reef wall featuring large red and violet sea fans, with sunbeams filtering through the water from the surface.

An underwater view of a Posidonia seagrass meadow with long green blades growing on a sandy seabed, illuminated by sunlight rippling through the clear water.

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A school of silver fish swims through the large, curved ribcage of a whale skeleton resting on the white sandy floor of a turquoise lagoon, with sunbeams filtering down from the surface.

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A sea turtle swims through clear blue water above a vibrant coral reef as sunlight streams down from the surface.

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Submerged mangrove roots with textured bark extend through clear turquoise water under bright sunlight.

A green sea turtle swims through clear turquoise water above a vibrant coral reef, with sun rays filtering down from the surface and a school of small fish swimming above.

A digital collage featuring a sea turtle swimming among coral reefs and small fish, with translucent layered panes, halftone patterns, and a circular reflection of sunlight on the water surface.

A wide-angle underwater view of a coral reef drop-off wall featuring large barrel sponges and purple tube sponges, with the sunlit surface visible far above in the deep blue water.

A freediver swims upward through columns of rising bubbles above a dark volcanic seabed with purple sea fans, illuminated by sun rays breaking through the water surface.

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A green sea turtle rests on the white sandy bottom of a shallow, clear bay, illuminated by sunlight filtering through the water.

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A sea turtle swims over a vibrant coral reef in clear, sunlit turquoise water.

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An underwater view of a rusted shipwreck covered in coral, with shafts of sunlight illuminating a large shoal of small fish swimming over the deck in clear blue water.

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An underwater view of a shallow reef with brain corals and a school of striped sergeant fish, looking up at a rain-pocked surface in soft grey-green light.

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A dense underwater scene of branching stony coral illuminated by a single shaft of blue light filtering down from the surface.

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A close-up view of Acropora coral releasing pink and white gamete bundles into the dark ocean water.

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A sea turtle swims near the surface of the ocean, silhouetted against a bright sunburst with light rays filtering down onto a coral reef below.

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