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Innovations and Georgia Aquaculture

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Innovations and Georgia Aquaculture ... Culture Several Recirculating Systems in Georgia Some ... net per year per system as a goal Only available ... – PowerPoint PPT presentation

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Title: Innovations and Georgia Aquaculture


1
Innovations and Georgia Aquaculture
  • Gary J. Burtle
  • Animal Dairy Science
  • The University of Georgia
  • www.cpes.peachnet.edu/aquaculture

2
Hybrid Catfish Project
  • Interest in Hybrid Catfish is gaining ground in
    the Southeast U.S.
  • Selling for 1.25 to 3.0 cents per inch depending
    on state and quantity
  • Highest prices in Alabama
  • Limited by fingerling availability

3
Spawning Hybrids
  • Need 5 yr old blue males, 4-5 year old channel
    females
  • Check females each week during spawning season
    and inject with carp pituitary
  • Inject male blue catfish with carp pituitary and
    dissect testes for in vitro fertilization after
    female is stripped of eggs, 3-5 females per male
  • Expect 3,000 to 4,000 fry per female

4
Hybridization Trial Results
  • 50 of females will produce eggs by stripping
    after hormone injection
  • Male blue catfish can be stimulated with urine
    from female blue catfish
  • Harvest testes within 24 hours of stimulation,
    urine or hormone
  • Maintain 78 degree water for best results

5
Hybrid Stocking
  • Obtain hybrid fingerlings from hatcheries with
    disease control programs
  • Have fingerlings inspected for disease prior to
    purchase
  • Apply chelated copper rather than copper sulfate
    for hybrid ponds
  • Stock 6,000 to 10,000 per acre
  • 0.05 to 1.5 pounds in 5 months

6
Vietnamese Catfish
  • Basa, Pangasius bacurti
  • Grown in cages on rice bran and dried fish
  • Sold as frozen fillets
  • From 7 million pounds in 2000 to over 20 million
    pounds in 2001
  • Illegal label until October 2001

7
Basa
8
Cage Culture of Basa
9
National Bill Sets Label Law
  • Introduced in House in early 2001 passed Senate
    in October
  • Requires catfish to be from the family
    Ictaluridae and excludes Siluridae or
    Pangasiidae

10
Status of Imported Catfish Label
  • Basa fish sold as catfish perceived as illegal
  • July 2001, Vietnam orders all basa labelled as
    product of Vietnam, Mekon catfish, basa catfish,
    or pangas catfish.
  • October 2001, US Senate passes label law to
    require proper catfish labeling

11
Impact of Vietnamese Catfish
  • 20 million pounds of fillets in 2001
  • 23 of farm raised catfish fillet market
  • 3 of US catfish market
  • Competition at time of US economic recession
  • Pond bank price below 50 cents per pound in
    Mississippi, 53 cents in Georgia

12
Fish Imports (1,000 lb)
Sept 2000 Sept 2001 Jan-Sep 2000 Jan-Sep 2001
Catfish Fillet 615 1,401 5,174 12,175
Tilapia Products 7,499 5,552 40,787 50,007
13
Cold Storage Holdings (1,000 lb) Down 8 to 13
since 2000
10-31-00 10-31-01 9-31-01
Catfish 12,906 11,873 13,337
Saltwater Total 278,085 240,879 240,713
14
Fresh Fish Prices at Fulton Market (Nov 30, 2001)
Catfish Fillet 2.75 /lb
Cod Fillet 4.00 /lb (2.00 frozen)
Tilapia Fillet 3.90 /lb
Hybrid Striped Bass Fillet 2.75 /lb
15
Tilapia Culture
  • Several Recirculating Systems in Georgia
  • Some small hydroponics systems also in Georgia
  • Processing in North Carolina by Southern States
    Cooperative
  • Systems are in a 45-50 mile radius of Valdosta

16
Economics of Tilapia Culture
  • Based on capital provided by others
  • Must have land and positive net worth
  • Must be identifiable as a farmer
  • Approximately 20,000 net per year per system as
    a goal
  • Only available through Southern States Cooperative

17
Freshwater Prawns
  • Machrobrachium rosenbergii
  • An exotic shrimp from Malaysia
  • Tropical
  • Lives in freshwater for part of its life-cycle

18
U. S. Prawn Culture
  • Of interest for over 25 years
  • Limited by the availability of seed stock
  • Cultured in Texas, Kentucky, Mississippi, South
    Carolina, Tennessee, recently in Georgia
  • Average production 500 to 800 pounds per acre.
  • Maximum production about 2,500 lb/A.

19
Prawn Production in Ponds
  • Prepare pond for stocking
  • Stock 10,000 to 30,000 juveniles per acre
  • Fertilize for first 30 60 days
  • Feed a sinking feed during months 2-4
  • Monitor and control oxygen and pH
  • Use narrow ponds less than 2 acres in size
  • Harvest before water falls below 60 degrees

20
Proper Sized Juvenile Prawns
  • 60 day old, 95/oz
  • 28-35 day old, 250 to 280 per oz
  • Uniform size very important
  • Careful handling and stocking are essential to
    juvenile survival
  • Avoid overcrowding

21
Feeding Prawns
  • Start with cottonseed meal and N-P-K
  • Use sinking catfish feed for 500 to 800 lb/A
  • Use shrimp diet for higher yields
  • Monitor zooplankton with net during first month
  • Feed over entire pond area
  • Estimate feed rate based on prawn samples

22
Water Quality in Prawn Ponds
  • Aerate continuously
  • Keep oxygen above 3.0 ppm
  • Monitor pH twice each day
  • Flush with water to keep below 9.0 (Use pond
    water of low pH if possible)
  • Add gypsum to lower pH, 1,000 to 2,000 lb/Acre
    added as needed

23
Harvest Procedure
  • Seine most of prawns with water at 1/2 depth
  • Use 1/2 inch mesh seine, grade with bar grader,
    62/64 width
  • Consider partial harvest one month before end of
    season
  • Final harvest requires pond draining

24
Economic Sketch
  • Breakeven at 1,000 lb/A is about 5.00 per pound
  • Juveniles cost 1,500 to 3,000 per acre
  • Feed costs 300 to 550 per acre
  • Aeration costs 200 to 400 per acre
  • Labor cost 800 to 1,200 per acre
  • Variable cost total2,800 to 5,100 per acre

25
Litopenaeus vannamei
26
Conditions for Culture
  • 0.5 to 2.0 parts per thousand salinity
  • Recirculated water or small, aerated ponds
  • Establish bacterial food source as well as
    feeding an adequate sinking pellet
  • Warm water temperatures would require indoor
    culture in Georgia
  • Indoor culture may prevent disease outbreak

27
Current Status of Perry Project
  • Contact William MacGrath 478-988-0590
  • Georgia Marine Shrimp Project
  • Looking for Cooperating Farmers for Phase 2 of
    project
  • Economics available in next 12 to 24 months
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