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 is headed.

He steers the boat to an unmarked spot he knows as the “coral nursery.” ‘’It’s like a forest under the sea,” he says, fastening his oxygen tank before tipping backward into the azure waters. He swims straight down 25 feet 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.

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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 individually planting each blade of grass in a lawn.

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 an underwater site called Dickie’s Reef, Simpson uses 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 jump-start the natural growth of a coral reef. And so far, it’s working.

Almost everyone in Jamaica depends on the sea, including the energetic 68-year-old Simpson. Once a spear fisherman and later a scuba-diving instructor, he started working as a “coral gardener” two years ago — part of grass-roots efforts to bring Jamaica’s coral reefs back from the brink.

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

Just 2 percent of the ocean floor is filled with coral, but the branching structures 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 on the reef to evade danger and lay eggs, and they also eat up the coral’s rivals.

After several natural and man-made disasters in the 1980s and 1990s, Jamaica lost 85 percent of its once-bountiful reefs. Meanwhile, fish catches declined to a sixth of what they had been in the 1950s, pushing families depending on seafood closer to poverty.

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Many scientists thought 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 careful interventions.

The delicate labor of the coral gardener is only one part of restoring a reef. Convincing lifelong fishermen to curtail when and where they fish and controlling the surging waste dumped into the ocean are even trickier endeavors.

Still, the comeback effort is slowly gaining momentum.

“When you give nature a chance, she can repair herself,” says Stuart Sandin, a marine biologist at the Scripps Institution of Oceanography in La Jolla, Calif. “It’s not too late.”

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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 he found instead that humans can be either a blessing or a curse, depending on how they manage resources.

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

In the past 10 years, more than a dozen grass-roots-run coral nurseries and fish sanctuaries have sprung up, supported by small grants from foundations, local businesses such as hotels and scuba clinics, and the Jamaican government.

— Associated Press

This story, part of a series, was produced in partnership with the Howard Hughes Medical Institute’s Science Education Department.

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