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Threatened by fishing, big fish -- and their pee -- are key parts of coral reef ecosystems. When fish urinate, they release phosphorus into the water. This phosphorus, along with nitrogen excreted as ammonium through the gills of fish, is crucial to the survival and growth of coral reefs. In coral reefs where fishing occurs, nearly half of these key nutrients are absent from the ecosystem.

Fish pee is crucial to the survival and growth of coral reefs, and in reefs where fishing occurs, nearly half of the key nutrients from fish urine are absent from the ecosystem

A mesophotic coral reef located off the coast of Maui in the Hawaiian Islands lies between 100 and 300 feet below —and it's teeming with fish.

Massive coral reef discovered thriving off the coast of Maui in deep water

There's no bleaching in sight for the mesophotic coral reef, which is teeming with indigenous fish species.

This small, but robust robot will let scientists document the world's coral reefs in order to help preserve them.

Researchers build Arduino-powered robot for scanning coral reefs

Researchers build Arduino-powered robot, Scubo, for scanning coral reefs

Blowing tiny bubbles through seawater could help protect coral reefs and oyster farms from oceans turned increasingly acidic through human activities by stripping carbon dioxide (CO2) from coastal marine environments and transferring it to the atmosphere, Stanford scientists say.

Blowing tiny bubbles through seawater could help protect coral reefs and oyster farms from oceans turned increasingly acidic through human activities by stripping carbon dioxide from coastal marine environments and .

Rivers and lakes are under threat—and so are millions that fish in them.

Rivers and lakes are under threat—and so are millions that fish in them.

'Coral Colors' showcases the psychedelic beauty of marine invertebrates.

Time-lapse artist shines macro lens on contracting corals

'Coral Colors' time-lapse short film showcases the psychedelic beauty of marine invertebrates.

The survival of a spectacular coral fish from Indonesia may depend on a decision…

Banggai cardinalfish, so popular for aquariums, they may cease to exist in the wild, in the coral reefs of the world.

Follow NASA's lead and explore this natural wonder by air.

Why you should take a bird's-eye view of the Great Barrier Reef

Follow NASA's lead and explore this natural wonder by air.

New regulations aim to protect reefs by ending the thriving trade in giant clam handicrafts.

New regulations aim to protect reefs by ending the thriving trade in giant clam handicrafts.

Long-living fish can now be tracked for their whole lives with a single tag.

Self-powered fish tag tracks fish for as long as they swim

Long-living fish can now be tracked for their whole lives with a single tag.

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