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Intensive and Extensive Oyster Aquaculture

COWART SEAFOOD. CORPORATION. Intensive and Extensive Oyster Aquaculture. A.J. Erskine Bevans Oyster Company Cowart Seafood Corporation July 6 th , 2012. Potomac River. BEVANS. COWART. CHESAPEAKE BAY. Low salinity ~10-14ppt

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Intensive and Extensive Oyster Aquaculture

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  1. COWART SEAFOOD CORPORATION Intensive and Extensive Oyster Aquaculture A.J. Erskine Bevans Oyster Company Cowart Seafood Corporation July 6th, 2012

  2. Potomac River BEVANS COWART CHESAPEAKE BAY • Low salinity ~10-14ppt • Lower disease mortality compared to higher salinity regions ATLANTIC OCEAN VIRGINIA BEACH

  3. OUTLINE • Why aquaculture? • Development • Dual approach • Future

  4. REASONING • Readily available local product • Protection from cow-nose ray predation • Improved shucking yield • Commercial-scale volume for shucking at specific times of the year

  5. ‘PHASES’ Phase I : Commercial-scale development of seed nursery for intensive culture Phase II : Mechanization of nursery and development/mechanization of grow-out system for intensive culture. Development of extensive culture system. Phase III : Design and implementation of commercial-scale hatchery

  6. OYSTER AQUACULTURE • Intensive (containerized, protected, single seed): - high labor - high cost - high return • Extensive (planted loose, clustered seed): - low labor - low cost - low return

  7. Set larvae on finely ground shell Stock in nursery/FLUPSY Plant loose in cages 14 -21day larval period INTENSIVE AQUACULTURE

  8. FLoatingUPwellerSYstem (FLUPSY)

  9. CULTCHLESS SEED OYSTERS • Oyster larvae obtained directly from hatchery (triploid) • 4-8 weeks in FLUPSY to one inch in size • Planted in seed cages • Transferred to grow out cages in early spring • Maintenance coincides with splitting/harvesting • Harvest within 12-18 months

  10. 14-21 day larval period Plant on bottom Traditional harvest EXTENSIVE AQUACUTLURE Set larvae on shells

  11. CULTCHED SEED OYSTERS • Oyster larvae obtained directly from hatchery (diploid/triploid) • Set on whole oyster shells in large tanks • Held in tanks for ~10-14 days • Planted loose on bottom; no maintenance • Harvest between 18-24 months

  12. Phase III--Hatchery

  13. Future • Continue to expand intensive and extensive operations • Continue to refine hatchery operation • Management of nuisance species—cownose ray

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