NORTH CAROLINA, USA (CMC) — Researchers at the University of North Carolina (UNC) at Chapel Hill have called for the protection of Caribbean coral reefs , known as “supersites”, in order to restore the environmental and economic setback that has been inflicted by overfishing.

The report, published in the March 1 issue of the journal Science Advances, noted that up to 90 per cent of predatory fish are gone from Caribbean coral reefs, straining the ocean ecosystem and coastal economy.

The research, led by former UNC-Chapel Hill graduate student Abel Valdivia, working with John Bruno, a marine biologist at UNC College of Arts & Sciences, suggests that these supersites — reefs with many nooks and crannies on its surface that act as hiding places for prey (and attract predators) — should be prioritised for protection and could serve as regional models showcasing the value of biodiversity for tourism and other uses.

Other features that make a supersite are amount of available food, size of reef and proximity to mangroves.

“On land, a supersite would be a national park like Yellowstone, which naturally supports an abundance of varied wildlife and has been protected by the federal government,” said Bruno.

The team surveyed 39 reefs across The Bahamas, Cuba, Florida, Mexico and Belize, both inside and outside marine reserves, to determine how much fish had been lost by comparing fish biomass on pristine sites to fish biomass on a typical reef. They estimated the biomass in each location and found that 90 per cent of predatory fish were gone due to overfishing.

But the scientists found a ray of hope in that a small number of reef location, if protected, could substantially contribute to the recovery of predatory fish populations and help restore depleted species.

“Some features have a surprisingly large effect on how many predators a reef can support,” said Courtney Ellen Cox, a co-author and former UNC-Chapel Hill doctoral student now at the National Museum of Natural History in Washington, DC.

The report states that not long ago, large fishes were plentiful on coral reefs but are now largely absent due to targeted fishing.

“Today predators are larger and more abundant within the marine reserves than on unprotected, overfished reefs. But even some of the marine reserves have seen striking declines, largely due to lack of enforcement of fishing regulations.

The bottom line is protection of predatory fish is a win-win from both an environmental and an economical perspective,” said Bruno.

“A live shark is worth over a million dollars in tourism revenue over its lifespan because sharks live for decades and thousands of people will travel and dive just to see them up close,” said Valdivia, now at the Center for Biological Diversity in Oakland, California. “There is a massive economic incentive to restore and protect sharks and other top predators on coral reefs.”