Upload
shayla
View
124
Download
0
Tags:
Embed Size (px)
DESCRIPTION
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 - PowerPoint PPT Presentation
Citation preview
Intensive and Extensive Oyster Aquaculture
A.J. ErskineBevans Oyster Company
Cowart Seafood CorporationJuly 6th, 2012
CORPORATION
COWART SEAFOOD
VIRGINIA BEACH
BEVANS
COWART
ATLANTIC OCEAN
CHESAPEAKE BAY• Low salinity ~10-14ppt• Lower disease mortality compared to higher salinity regions
Potomac
River
OUTLINE
Why aquaculture? Development Dual approach Future
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
‘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
OYSTER AQUACULTURE
Intensive (containerized, protected, single seed):- high labor- high cost- high return
Extensive (planted loose, clustered seed):- low labor- low cost- low return
INTENSIVE AQUACULTURE
Set larvae on finely ground
shell
Plant loose in cages
Stock in nursery/FLUPSY
14 -21day larval period
FLoating UPweller SYstem (FLUPSY)
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
EXTENSIVE AQUACUTLURE
Traditional harvest
Plant on bottom
Set larvae on shells
14-21 day larval period
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
Phase III--Hatchery
Future
• Continue to expand intensive and extensive operations
• Continue to refine hatchery operation• Management of nuisance species—cownose
ray