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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

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

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

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.

Gila topminnows. Photo © Bruce Taubert, courtesy of Arizona Game and Fish Department

Once the Gila Basin’s dominant fish, the Gila topminnow has faced hard times from invasive species and water quality issues. But the future is now much brighter, Ted Williams reports.

Cuba Diving: Will Gardens of the Queen, a sprawling marine reserve, be threatened as the island nation opens to U.

Check out a live underwater view of a rocky reef in Melbourne, Australia, and then watch the gannet cam above the surface!

Reef Cam: An Underwater View of an Australian Rocky Reef

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What's next: ZOMBIE SHARKS! A tiger shark is turned into a zombie-like trance called tonic immobility

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 .

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.

blind cavefish can walk!!

Walking fish discovered in Thailand, has features not seen in any other living fish

The blind cavefish can actually walk and crawl up waterfalls like a four-footed animal; researchers are calling it a major discovery.

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