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OCHO RIOS, JAMAICA - Everton Simpson squints at the Caribbean from his motorboat, scanning the dazzling bands of color for hints of what lies beneath. Emerald green indicates sandy bottoms. Sapphire blue lies above seagrass meadows. And deep indigo marks coral reefs. That's where he's headed.

He steers the boat to an unmarked spot that he knows as the "coral nursery." "It's like a forest under the sea," he says, strapping on blue flippers and fastening his tank before tipping backward into the azure waters. He swims down 25 feet (7.6 meters) carrying a pair of metal shears, fishing line and a plastic crate.

On the ocean floor, small coral fragments dangle from suspended ropes, like socks hung on a laundry line. Simpson and other divers tend to this underwater nursery as gardeners mind a flower bed — slowly and painstakingly plucking off snails and fireworms that feast on immature coral.

When each stub grows to about the size of a human hand, Simpson collects them in his crate to individually "transplant" onto a reef, a process akin to planting each blade of grass in a lawn separately.

Even fast-growing coral species add just a few inches a year. And it's not possible to simply scatter seeds.

A few hours later, at a site called Dickie's Reef, Simpson dives again and uses bits of fishing line to tie clusters of staghorn coral onto rocky outcroppings — a temporary binding until the coral's limestone skeleton grows and fixes itself onto the rock. The goal is to jumpstart the natural growth of a coral reef. And so far, it's working.

Almost everyone in Jamaica depends on the sea, including Simpson, who lives in a modest house he built himself near the island's northern coast. The energetic 68-year-old has reinvented himself several times, but always made a living from the ocean.

Once a spear fisherman and later a scuba-diving instructor, Simpson started working as a "coral gardener" two years ago — part of grassroots efforts to bring Jamaica's coral reefs back from the brink.

'Rainforests of the sea'

Coral reefs are often called "rainforests of the sea" for the astonishing diversity of life they shelter.

Just 2% of the ocean floor is filled with coral, but the branching structures — shaped like everything from reindeer antlers to human brains — sustain a quarter of all marine species. Clown fish, parrotfish, groupers and snappers lay eggs and hide from predators in the reef's nooks and crannies, and their presence draws eels, sea snakes, octopuses and even sharks. In healthy reefs, jellyfish and sea turtles are regular visitors.

With fish and coral, it's a codependent relationship — the fish rely upon the reef structure to evade danger and lay eggs, and they also eat up the coral's rivals.

Life on the ocean floor is like a slow-motion competition for space, or an underwater game of musical chairs. Tropical fish and other marine animals, like black sea urchins, munch on fast-growing algae and seaweed that may otherwise outcompete the slow-growing coral for space. When too many fish disappear, the coral suffers — and vice-versa.

After a series of natural and man-made disasters in the 1980s and 1990s, Jamaica lost 85% of its once-bountiful coral reefs. Meanwhile, fish catches declined to a sixth of what they had been in the 1950s, pushing families that depend on seafood closer to poverty. Many scientists thought that most of Jamaica's coral reef had been permanently replaced by seaweed, like jungle overtaking a ruined cathedral.

But today, the corals and tropical fish are slowly reappearing, thanks in part to a series of careful interventions.

Restoring reefs

The delicate labor of the coral gardener is only one part of restoring a reef — and for all its intricacy, it's actually the most straightforward part. Convincing lifelong fishermen to curtail when and where they fish and controlling the surging waste dumped into the ocean are trickier endeavors.

Still, slowly, the comeback effort is gaining momentum.

"The coral are coming back; the fish are coming back," says Stuart Sandin, a marine biologist at the Scripps Institution of Oceanography in La Jolla, California. "It's probably some of the most vibrant coral reefs we've seen in Jamaica since the 1970s."

"When you give nature a chance, she can repair herself," he adds. "It's not too late."

Sandin is studying the health of coral reefs around the world as part of a research project called the "100 Island Challenge." His starting assumption was that the most populated islands would have the most degraded habitats, but what he found instead is that humans can be either a blessing or a curse, depending on how they manage resources.

In Jamaica, more than a dozen grassroots-run coral nurseries and fish sanctuaries have sprung up in the past decade, supported by small grants from foundations, local businesses such as hotels and scuba clinics, and the Jamaican government.

At White River Fish Sanctuary, which is only about 2 years old and where Simpson works, the clearest proof of early success is the return of tropical fish that inhabit the reefs, as well as hungry pelicans, skimming the surface of the water to feed on them.

Jamaica's coral reefs were once among the world's most celebrated, with their golden branching structures and resident bright-colored fish drawing the attention of travelers from Christopher Columbus to Ian Fleming, who wrote most of his James Bond novels on the island nation's northern coast in the 1950s and '60s.

In 1965, the country became the site of the first global research hub for coral reefs, the Discovery Bay Marine Lab, now associated with the University of the West Indies. The pathbreaking marine biologist couple Thomas and Nora Goreau completed fundamental research here, including describing the symbiotic relationship between coral and algae and pioneering the use of scuba equipment for marine studies.

Disasters

The same lab also provided a vantage point as the coral disappeared.

Peter Gayle has been a marine biologist at Discovery Bay since 1985. From the yard outside his office, he points toward the reef crest about 300 meters away — a thin brown line splashed with white waves. "Before 1980, Jamaica had healthy coral," he notes. Then several disasters struck.

The first calamity was 1980's Hurricane Allen, one of the most powerful cyclones in recorded history. "Its 40-foot waves crashed against the shore and basically chewed up the reef," Gayle says. Coral can grow back after natural disasters, but only when given a chance to recover — which it never got.

That same decade, a mysterious epidemic killed more than 95% of the black sea urchins in the Caribbean, while overfishing ravaged fish populations. And surging waste from the island's growing human population, which nearly doubled between 1960 and 2010, released chemicals and nutrients into the water that spur faster algae growth. The result: Seaweed and algae took over.

"There was a tipping point in the 1980s, when it switched from being a coral-dominated system to being an algae-dominated system," Gayle says. "Scientists call it a 'phase shift.'"

That seemed like the end of the story, until an unlikely alliance started to tip the ecosystem back in the other direction, with help from residents like Everton Simpson and his fellow fisherman Lipton Bailey.

Protecting reefs

The fishing community of White River revolves around a small boat-docking area about a quarter-mile from where the river flows into the Caribbean Sea. One early morning, as purple dawn light filters into the sky, Simpson and Bailey step onto a 28-foot motorboat called the Interceptor.

Both men have lived and fished their whole lives in the community. Recently, they have come to believe that they need to protect the coral reefs that attract tropical fish, while setting limits on fishing to ensure the sea isn't emptied too quickly.

In the White River area, the solution was to create a protected area — a "fish sanctuary" — for immature fish to grow and reach reproductive age before they are caught.

Two years ago, the fishermen joined with local businesses, including hotel owners, to form a marine association and negotiate the boundaries for a no-fishing zone stretching two miles along the coast. A simple line in the water is hardly a deterrent, however; to make the boundary meaningful, it must be enforced. Today, the local fishermen, including Simpson and Bailey, take turns patrolling the boundary in the Interceptor.

On this morning, the men steer the boat just outside a row of orange buoys marked "No Fishing." "We are looking for violators," Bailey says, his eyes trained on the rocky coast. "Sometimes you find spearmen. They think they're smart. We try to beat them at their game."

Most of the older and more established fishermen, who own boats and set out lines and wire cages, have come to accept the no-fishing zone. Besides, the risk of having their equipment confiscated is too great. But not everyone is on board. Some younger men hunt with lightweight spearguns, swimming out to sea and firing at close-range. These men — some of them poor and with few options — are the most likely trespassers.

The patrols carry no weapons, so they must master the art of persuasion. "Let them understand this. It's not a you thing or a me thing. This isn't personal," Bailey says of past encounters with violators.

These are sometimes risky efforts. Two years ago, Jerlene Layne, a manager at nearby Boscobel Fish Sanctuary, landed in the hospital with a bruised leg after being attacked by a man she had reprimanded for fishing illegally in the sanctuary. "He used a stick to hit my leg because I was doing my job, telling him he cannot fish in the protected area," she says.

Layne believes her work would be safer with more formal support from the police, but she isn't going to stop.

"Public mindsets can change," she says. "If I back down on this, what kind of message does that send? You have to stand for something."

She has pressed charges in court against repeat trespassers, typically resulting in a fine and equipment confiscation.

Boundary skeptics

One such violator is Damian Brown, 33, who lives in a coastal neighborhood called Stewart Town. Sitting outside on a concrete staircase near his modest home, Brown says fishing is his only option for work — and he believes the sanctuary boundaries extend too far.

But others who once were skeptical say they've come to see limits as a good thing.

Back at the White River docking area, Rick Walker, a 35-year-old spearfisherman, is cleaning his motorboat. He remembers the early opposition to the fish sanctuary, with many people saying, "'No, they're trying to stop our livelihood.'"

Two years later, Walker, who is not involved in running the sanctuary but supports its boundary, says he can see the benefits. "It's easier to catch snapper and barracuda," he says. "At least my great grandkids will get to see some fish."

When Columbus landed in Jamaica, he sailed into Oracabessa Bay, today a 20-minute drive from the mouth of the White River.

Oracabessa Bay Fish Sanctuary was the first of the grassroots-led efforts to revive Jamaica's coral reefs. Its sanctuary was legally incorporated in 2010, and its approach of enlisting local fishermen as patrols became a model for other regions.

"The fishermen are mostly on board and happy, that's the distinction. That's why it's working," sanctuary manager Inilek Wilmot says.

David Murray, head of the Oracabessa Fishers' Association, notes that Jamaica's 60,000 fishermen operate without a safety net. "Fishing is like gambling, it's a game. Sometimes you catch something, sometimes you don't," he says.

Fish populations

When fish populations began to collapse two decades ago, something had to change.

Murray now works as a warden in the Oracabessa sanctuary, while continuing to fish outside its boundary. He also spends time explaining the concept to neighbors.

"It's people work — it's a process to get people to agree on a sanctuary boundary," he says. "It's a tough job to tell a man who's been fishing all his life that he can't fish here."

But once it became clear that a no-fishing zone actually helped nearby fish populations rebound, it became easier to build support. The number of fish in the sanctuary has doubled between 2011 and 2017, and the individual fish have grown larger — nearly tripling in length on average — according to annual surveys by Jamaica's National Environment and Planning Agency. And that boosts catches in surrounding areas.

After word got out about Oracabessa, other regions wanted advice.

"We have the data to show success, but even more important than data is word of mouth," says Wilmot, who oversaw training to help start the fish sanctuary at White River.

Belinda Morrow, a lifelong water-sports enthusiast often seen paddle-boarding with her dog Shadow, runs the White River Marine Association. She attends fishers' meetings and raises small grants from the Jamaican government and other foundations to support equipment purchases and coral replanting campaigns.

"We all depend on the ocean," Morrow says, sitting in a small office decorated with nautical maps in the iconic 70-year-old Jamaica Inn. "If we don't have a good healthy reef and a good healthy marine environment, we will lose too much. Too much of the country relies on the sea."