Coral reefs wouldn't be the same without their beautiful fish. A diversity of colorful, beautifully patterned species lives in tandem¹ with coral reefs around the world, having adapted their appearance, body structure and lifestyle to take refuge in the folds of spiny², spongy, slippery reefs.

 

Recent studies suggest that coral reefs, however, are just as dependent on these fish for key nutrients³ that help coral grow. 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.

 

A new study appearing Aug. 16 in Nature Communications takes this a step further, finding that in coral reefs where fishing occurs, nearly half of these key nutrients are absent from the ecosystem⁴.

 

The main reason? Fewer large-bodied and predator⁵ fish to pee nutrients into the water, the study found.

 

"Part of the reason coral reefs work is because animals play a big role in moving nutrients around," said lead author Jacob Allgeier, a postdoctoral researcher at the University of Washington's School of Aquatic⁶ and Fishery Sciences.

 

"Fish hold a large proportion, if not most of the nutrients in a coral reef in their tissue, and they're also in charge of recycling them. If you take the big fish out, you're removing all of those nutrients from the ecosystem."

 

Paper co-authors Abel Valdivia at the Center for Biological Diversity in San Francisco and Courtney Cox at Smithsonian Marine⁷ Station at Fort Pierce, Florida, surveyed 143 fish species at 110 sites across 43 Caribbean coral reefs that varied⁸ in the amount of fishing pressure sustained -- ranging from marine preserves that banned all fishing to heavily fished reefs where large predator fish are almost gone.

 

The researchers found that reefs with more large, predator fish had healthy levels of nutrients, while reefs depleted⁹ of large fish had nearly 50 percent fewer nutrients, including phosphorous and nitrogen, essential to their survival.

 

"This study is useful to understand alternative ways fishing is affecting coral reef ecosystems," Allgeier said.

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