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William D. Anderson & James M. Monck SCDNR Marine Resources Division ICSR 2006 Commercial Techniques in Shellfish Resource Enhancement and Restoration.

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Presentation on theme: "William D. Anderson & James M. Monck SCDNR Marine Resources Division ICSR 2006 Commercial Techniques in Shellfish Resource Enhancement and Restoration."— Presentation transcript:

1 William D. Anderson & James M. Monck SCDNR Marine Resources Division ICSR 2006 Commercial Techniques in Shellfish Resource Enhancement and Restoration

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9 South Carolina Shellfish Industry Transformation 1986

10 Commercial Permit Requirements 116 oyster culture permits (leases) - 90,000 bushels planted each year Annual rent = $5.00/acre Plant 50 bushels of cultch or equivalent/acre (SC state law) Shortage of oyster shell for planting Plethora of oyster larvae in SC Innovative cultivation methods

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16 2004 Oyster Production Source – NMFS Commercial Fisheries Annual Landings 2004

17 Shellfish Season – Sep 16 – May 15

18 SC Oyster Shell Planting Percentages of Total Cultch %

19 “Shell Planting” 115 year history – preferred method Highest recruitment Scarcity of oyster shells Expensive husbandry process “Washed shell” – for subtidal protective overburden

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25 Seed Planting Reduces high-density oysters Sometimes utilizes polluted areas closed to harvesting Polluted areas must be pre-approved by DHEC & DNR Shorter grow-out period Accelerated growth

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31 “Raking Down” Breaks up aggregates of small oysters Reduces density of intertidal clusters Moves oysters from high/mid intertidal to lower intertidal Movement results in accelerated growth Works best in high density, low wave energy habitat

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35 Bamboo Stakes Alternative method of spat collection Must be pre-approved by DNR 6 stakes = 1 bushel of oysters upon grow- out Can be planted on soft bottoms More resilient than wooden stakes Inhibits shoreline erosion

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41 Untreated Wooden Stakes Alternative method of spat collection Must be pre-approved by DNR 6 stakes = 1 bushel of oysters upon grow- out Can be planted on soft bottoms Untreated oak stakes sometimes rot & oysters are smothered

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45 Calcium Magnesium Phosphate Also known as ROC & limestone aggregate Not as successful as Gulf Coast results Must be pre-approved by DNR Used as protective clam habitat

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48 Reinforcement wire Location must be pre-approved by DNR Used in remote areas May take time to attract cultch Utilizes soft bottom areas Restorative process in 10’ lengths

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53 “Green” Oyster Shells Oysters replanted within 3 days after shucking – year round Small oysters on shells survive High propensity for spat attraction Suitable for shucking operations

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56 Abandoned Crab Traps Innovative method to establish oyster habitat Recycles and “crab proofs” traps Utilizes soft bottoms areas Production = 2.5 bushels oysters per trap

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59 Future Trends Sustained commercial participation & production Conservation of critical intertidal oyster habitat Single oyster cultivation Wildstock oyster and clam propagation Shellfish conservation initiatives

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61 South Carolina Clam Cash Receipts and Aquaculture Permits

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