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Sea Life
Coral Choir

This scene plays out every week in parts of Fiji: A local villager, standing in a clear turquoise lagoon beneath azure skies, swings a crowbar and hacks off a piece of the reef just offshore this small island nation in the South Pacific. The live rock—the substrate on which coral and other reef organisms are growing—earns the villager 15 cents per pound because of demand from the worldwide marine aquarium industry. In fact, trade in coral and live rock is increasing by up to 50 percent a year, and today more than 2,000 tons of the substrate are traded worldwide, more than 1,000 tons of it exported from Fiji. “This is not a sustainable use,” says Mark Hay, a biology professor at Georgia Tech. “The villagers understand this, but they have a small number of ways of acquiring money. They don’t want to be doing this, but they need to.”

Breaking off pieces of the reef can increase coastal erosion and destroy wildlife habitat, thereby decreasing biodiversity. Hay and colleagues at Georgia Tech and the University of the South Pacific in Fiji came up with a way to integrate reef conservation, economic development, and bioprospecting—the search for potential pharmaceuticals in nature.

Working in the village of Tagaqe, the research team purchased 5,000 “blanks”—pumice stones mixed with concrete for added weight—strung them on wires, and placed them on a sandy part of the fringing reef. Six months later coral, algae, and other reef organisms had colonized the blanks, creating artificial, or cultured, live rock. When placed into a marine aquarium, these pieces, much like their natural counterparts, will sprout whatever species are growing in their crevices.

The largest marine life exporter operating in Fiji, Walt Smith International, which practices a more sustainable method of collecting loose live rock from tidal flats that contain little coral growth, agreed to purchase the entire crop from the villagers of Tagaqe, who used half the money to purchase more blanks. The villagers are thrilled, says Kirk Bowman, associate professor of international affairs at Georgia Tech. “The live rock project provides them both with a greater awareness of the wonderful resources that they have and some income generated through the sustainable use of their own resources.” —Todd Neale

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