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N.C. Department of Environment and Natural Resources

NC Department of Environment and Natural Resources
Marine Fisheries - 34 Hard Clams SSR 2013

Marine Fisheries

Hard Clam

Hard Clam - 2013

Stock Status - Unknown - Little data on hard clams have been collected in North Carolina. Commercial landings are below the 10-year average. Recreational landings are unknown.

Average Commercial Landings and Value 2003–2012 – 411,601 lbs. of meat/$2,583,128

2012 Commercial Landings and Value – 396,285 lbs. of meat/$2,255,269

Average Recreational Landings 2003–2012 – Unknown, 2012 – Unknown

Status of Fisheries Management Plan (FMP) – A state FMP was approved in 2001 by the N.C. Marine Fisheries Commission and Amendment 1 was approved in 2008. Amendment 1 recommended that the hard clam fishery continue to harvest at current daily harvest limits, eliminate the mechanical clam harvest rotation in Pamlico Sound, institute a resting period in the northern Core Sound mechanical clam harvest area, and develop sampling programs to collect information necessary for the completion of a hard clam stock assessment. The five year review of the FMP is scheduled to begin in 2013.

Research and Data Needs – Expand shellfish mapping, determine abundance estimates, and collect recreational harvest data. Stock identification, recruitment, and effects of cultch research studies are needed.

2012 Minimum Size Limit – 1-inch thick

Harvest Season – Daily commercial harvest limits are no more than 6,250 clams (25 bags at 250 clams per bag) per fishing operation in any coastal fishing waters regardless of the harvest methods employed. By hand, the season is open year round. Mechanical harvest season is December 1 - March 31 and is opened by proclamation. A daily harvest limit of no more than 3,750 clams (15 bags at 250 clams per bag) is allowed per commercial fishing operation in North River, Newport River, and Bogue Sound. Mechanical harvest in White Oak River, the Intracoastal Waterway of Onslow and Pender counties (Marker 65 to the BC Marker at Banks Channel), and New River are rotated on a yearly basis with maximum daily limits of 6,250 clams (25 bags at 250 clams per bag) per operation. Core Sound is divided into two areas; the northern area is open and closed every other year and the southern area is open each year, with a daily harvest limit of 5,000 clams per operation. Recreational harvest limits are 100 clams per person per day and no more than 200 clams per vessel.

Size and Age at Maturity – 1.5 inches, (shell height)/1.5 years

Historical and Current Maximum Age – 45 years/Unknown

Juvenile Abundance Indices Average 2003-2012 – Unknown, 2012 – Unknown

Habits and Habitats – Hard clams are mostly estuarine-dependent mollusks found in sandy and vegetated bottoms. Spawning occurs from May through November when water temperatures reach between 68 degrees and 86 degrees Fahrenheit. The larvae go through several pelagic stages before settling onto a suitable substrate. During the juvenile stages, hard clams tend to be dominantly male and then become either male or female as they mature into adults. Maturity is determined by size and therefore dependent on growth. Growth rates are highly variable because of temperature, food availability, and genetic disposition. Hard clams are suspension-feeding bivalves and feed on diatoms.

For more information, please contact Tina Moore at Tina.Moore@ncdenr.gov or 800-682-2632 or 252-808-8082.

N.C. Division of Marine Fisheries • 3441 Arendell Street • Morehead City, NC 28557 • 252-726-7021 or 800-682-2632

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