Monitoring takes center stage with local consumption on the rise

Thursday, July 6, 2023
President Dean speaks to Brian Gennaco, who started Virgin Oyster Co.

Brian Gennaco, founder of the Virgin Oyster Co., talks with Ò×ʤ²©¹ÙÍø President Jim Dean on the waters of Great Bay.

Ò×ʤ²©¹ÙÍø research and outreach helped revitalize Ò×ʤ²©¹Ù꿉۪s commercial oyster aquaculture industry over the past decade. Now, the state has turned to Ò×ʤ²©¹ÙÍø researchers to ensure diners stay healthy while enjoying these briny bivalves.ÌýThis was originally produced by theÌý, an independent local newsroom that allows Ò×ʤ²©¹ÙÍø Today and other outlets to republish itsÌýreporting.

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Plump, briny oysters harvested in Ò×ʤ²©¹ÙÍø are finding their way onto more menus, and state officials say it’s time to start evaluating the risk for a naturally occurring bacteria that’s made headlines elsewhere.Ìý

The Department of Environmental Services is contracting with a University of Ò×ʤ²©¹ÙÍø laboratory to test oysters for Vibrio parahaemolyticus, aÌýgastrointestinalÌýillness associated with the consumption of raw shellfish. According to the Centers for Disease Control and Prevention, the bacteria, whichÌýnaturally inhabits coastal waters where oysters live, can cause diarrhea, abdominal cramps, nausea, vomiting, fever, and headaches that last between one and seven days.Ìý

The call for testing comes as people in Ò×ʤ²©¹ÙÍø are eating more local oysters. In recent years, the Granite State’s commercial oyster aquaculture industry has grown substantially, from two licensed sites in 2010 to 32 in 2023. Oysters have madeÌý,Ìýwhich is designated as one of 28 estuaries of national significance by the Environmental Protection Agency’s National Estuary Program.

DES officials say an evaluation of current bacteria levels in Ò×ʤ²©¹ÙÍø oysters is needed to “develop baseline information, assess risk, and inform management strategies to help mitigate the risk to protect shellfish consumers as well as the shellfish industry.â€

As approved by the Executive Council Wednesday, the state will contract with Ò×ʤ²©¹Ù꿉۪s Department of Natural Resources and Marine Science to test and analyze oyster samples collected as part of an interagency monitoring program this summer and fall. In its request for funding, DES wrote that raw shellfish consumers are at the greatest risk for becoming ill in the warmer summer months when the bacteria seems to be more prevalent.Ìý

Vibrio-related illness outbreaks have been traced to shellfish harvest areas in Massachusetts and Connecticut. Massachusetts now has aÌýÌýthat tracks the conditions of oyster harvests in the state.Ìý

Ò×ʤ²©¹ÙÍø has not yet experienced any Vibrio-related illnesses, and Ò×ʤ²©¹Ù꿉۪sÌýCheryl Whistler,Ìý a professor of molecular, cellular, and biomedical science,Ìýif that’s because of the state’s policy to prevent the importing of oyster seed from areas affected by a virulent strain of Vibrio. She’s also looking at mitigation and detection measures to strengthen resiliency of the state’s growing aquaculture industry.Ìý

Ìýis part of States Newsroom, a network of news bureaus supported by grants and a coalition of donors as a 501c(3) public charity. Ò×ʤ²©¹ÙÍø Bulletin maintains editorial independence. Contact Editor Dana Wormald for questions:Ìýinfo@newhampshirebulletin.com.Ìý

Photographer: 
Jeremy Gasowski | Ò×ʤ²©¹ÙÍø Marketing | jeremy.gasowski@unh.edu | 603-862-4465