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UNH researcher restoring oyster reefs to Great Bay

In the past decade, the oyster population in New Hampshire's Great Bay estuary has plummeted by 90 percent, due to the 1995 arrival of the oyster disease MSX. The previous century saw a slower but equally devastating demise of oysters from exuberant overharvesting. "We have seen local extinction on some reefs," says Ray Grizzle, research associate professor at the University of New Hampshire's Jackson Estuarine Laboratory.

Now Grizzle is working to bring oysters back to Great Bay ?lots of them. He's helping the state of New Hampshire meet its established goal of restoring 20 acres of oyster reefs by 2010. "I hope we're going to have a bay with a healthy oyster population, and we're going to work hard to do it," he says. His research explores which are the best reef restoration techniques for the Great Bay estuarine system (www.oysters.unh.edu).

Oyster reef restoration involves providing sufficient hard substrate ?typically oyster shells on which young oysters settle and grow ?and seeding it with disease-resistant young oysters. Natural oyster reefs are formed by live oysters atop mounds of empty shells; one initiative of Grizzle's lab is soliciting "recycled" empty shells from oyster harvesters that will eventually be returned to the bay to provide substrate.

Grizzle likens his role in oyster reef restoration to an "ecological physician." Just as an orthopedist can set a broken bone but the body must do the healing, he can set up conditions that are right for oyster reefs to prosper, but factors beyond his control ?water quality, larval abundances, and other conditions he's exploring ?play a major role in his success.

At five different restoration sites around the Great Bay estuarine system, Grizzle and his team are experimenting with optimal conditions for reef restoration. One major research question is whether several small or one large reef promote abundance, survival and growth of the larval oysters (called "spat" when they are
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Source:University of New Hampshire


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