Dr. Les Torrans - NC Aquaculture Development Conference

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Experimental Design• Ten 17-acre ponds• Three 10-hp paddlewheels per pond• Single-batch system (clean harvest)• Brought into study in pairs• Standard farm management practices• Water quality sampled twice/month
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Refinements in PondAquacultureLes T
Page 3 and 4: 6:208:2010:2012:2014:2016:2018:2020
Page 14 and 15: Aeration vs. Feed
Page 17: What D.O. concentrationdo catfish n
Page 23: ©2003 Les Torrans
Page 26 and 27: Minimum Daily D.O., 20021412Low Oxy
Page 28 and 29: Torrans - Catfish Oxygen Studies100
Page 32: Torrans - Catfish Oxygen Studies100
Page 37 and 38: Roland Schmidt, Aerway Mfg. Co.,“
Page 39 and 40: P.A.S. / Wilfley-WeberSubterranian
Page 43: 5-HP 3-phasemotorDiffuser in mouth
Page 48: Aerators placed in parallel on the
Page 51 and 52: “Standard” Paddlewheel Placemen
Page 53: Paul D. DeesDillard & Co, Inc.
Page 58 and 59: Dissolved OxygenMonthMayJuneJulyAug
Page 60: AerationTractorsType(days/yr)NewSys
Page 64: PrecisionAeration:Apply OxygenDirec
Page 68: Photo courtesy ofSteven Asmus
Page 71 and 72: Sock-Saver II: the Redneck VersionC
Page 74 and 75: Oxygen Consumption of ChannelCatfis
Page 78 and 79: Eight tanks, O 2(232%)Supersaturate
Page 80 and 81: ProbePCV ProbeHolderEggPlatformSpin
Page 82 and 83: 1200“Standard”Metabolic Rate110
Page 84 and 85: 1200Horsepower1100RestrictorPlate S
Page 86 and 87: 1600Metabolic Rate14001200mg O2/kg-
Page 88 and 89: 1600Metabolic Rate14001200mg O2/kg-
Page 90 and 91: Incipient Limiting Oxygen LevelO2 S
Page 92 and 93: Incipient Limiting Oxygen LevelO2 S
Page 94: Incipient Limiting Oxygen LevelO2 S
Page 97: Commercial Implications• Of 26 co
Page 101 and 102: After 15 years of continuous use
Page 103 and 104: Environmental Management System•
Page 105 and 106:
Results (after 3 years)• Average
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Results (after 3 years)ParameterTot
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Channel x Blue Catfish Hybrids• S
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• Limited production• Advantage
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Why Switch?• Economics of multipl
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Using Aquaflor ®• For use in Cat
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AQUAVAC-ESC®Vaccine
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Intervet, Inc. Websitehttp://www. i
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Impact on Production• Severe infe
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Daniel Petre, Prairie Welding and S
Page 125:
“Zipper” SockOld SockZipper Soc
Page 132:
ltorrans@ars.usda.gov662-390-3882
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Dr. Les Torrans - NC Aquaculture Development Conference

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