louisiana oyster management in the wake of major hurricanes patrick d. banks marine fisheries...
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Louisiana Oyster Management
In The Wake Of Major Hurricanes
Patrick D. BanksMarine Fisheries BiologistLouisiana Department of
Wildlife and Fisheries
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OVERVIEW Oyster Landings In Louisiana Recent History of Storms Step-Wise Response Current Plans For Rehabilitation Other Management Actions
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Historical Louisiana Oyster Landings
Source: NMFS and LDWF
0
2
4
6
8
10
12
70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04
Year
pounds (millions)
Private Public
\
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RECENT STORMS Hurricane Andrew – August 1992 Tropical Storm Allison – June 2001 Hurricane Lili – Sept/Oct. 2002 Hurricane Ivan – September 2004 Hurricane Katrina – August 2005 Hurricane Rita – September 2005
In general, heavy oyster mortalities associated with:1. Sediment and vegetative overburden2. Hypoxic and/or anoxic conditions3. Low salinity from freshwater runoff4. Salinity shock from storm surge?
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STEP-WISE RESPONSE
1. Fisheries independent biological monitoring2. Post-storm biological sampling3. Data analysis4. Report preparation5. Walk The Hill6. Develop and submit disaster grant proposal7. Prepare plans for rehabilitation activities8. Execute oyster resource rehabilitation9. Perform biological monitoring10. Document rehabilitation
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CULTCH DEPOSITION GOAL: Provide suitable substrate for larval
attachment and growth Important habitat management tool Cultch material
• Clam shell• Crushed oyster shell• Limestone• Crushed concrete
Began in 1919• Over 1.4 million yd3
• Nearly 30,000 acres• Most recent – Summer 2004
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REHABILITATION PLANS
$23M earmarked for oyster rehabilitation• $13M – private leases• $10M – public grounds
Private lease program• Sediment and debris removal• Cultch planting• Transplanting seed oysters• Relaying oysters from closed to open areas
Public ground rehabilitation• Water bottom mapping• Cultch planting
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OTHER MANAGEMENT ACTIONS
Adjust oyster season framework Develop harvest area limitations May set harvest levels Other protection activities
For Public Oyster Areas
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IN SUMMARY Strong history of stable landings Long history of major storms Rehabilitation begins quickly Multiple management tools utilized to assist with rehabilitation