Dr. Les Torrans - NC Aquaculture Development Conference

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Sedimentation and Oxygen LossOld Pond New Pond• Depth 2 ft, DO 10 ppm• Plankton 0.60 mg/l/h• Sediment 500 mg/m2• 5.5 Hours till DO=2• Depth 6 ft, DO 10 ppm• Plankton 0.60 mg/l/h• Sediment 500 mg/m2• 7.8 Hours till DO=22.3 hours aeration saved per night!J.A. Steeby. 2004.
Environmental Management System• Research to reduce the discharge ofpotential pollutants• Consisted of four farm practicesimplemented together• Four year study in large ponds• Continuous production• Measured effluent dischargevolume and quality, wateraddition, and productionC. Tucker. 2005.
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Refinements in PondAquacultureLes T
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6:208:2010:2012:2014:2016:2018:2020
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Aeration vs. Feed
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What D.O. concentrationdo catfish n
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©2003 Les Torrans
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Minimum Daily D.O., 20021412Low Oxy
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Torrans - Catfish Oxygen Studies100
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Roland Schmidt, Aerway Mfg. Co.,“
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P.A.S. / Wilfley-WeberSubterranian
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5-HP 3-phasemotorDiffuser in mouth
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Aerators placed in parallel on the
Page 51 and 52: “Standard” Paddlewheel Placemen
Page 53 and 54: Paul D. DeesDillard & Co, Inc.
Page 57 and 58: Water QualityParameterNewSystemOldS
Page 59 and 60: ProductionParameterNet Yield(lbs/ac
Page 63 and 64: • 550 acre Mississippi delta farm
Page 66: The Sock-SaverSaver
Page 70 and 71: Total Cost: $8300
Page 72: Total Cost: $2300Photograph courtes
Page 75: Established CatfishSpawning Techniq
Page 79 and 80: Effect of Dissolved Oxygen onCatfis
Page 81 and 82: D.O. Conc. (mg/L)10.09.08.07.06.05.
Page 83 and 84: 1200Horsepower1100Limiting OxygenLe
Page 85 and 86: 1600Metabolic Rate14001200mg O2/kg-
Page 87 and 88: 1600Metabolic Rate14001200mg O2/kg-
Page 89 and 90: Incipient Limiting Oxygen LevelO2 S
Page 91 and 92: Incipient Limiting Oxygen LevelO2 S
Page 93 and 94: 65Drop in DO Inside Spawn (mg/L)432
Page 96 and 97: Effect of Dissolved Oxygen onCatfis
Page 100 and 101: Recent Developments
Page 104 and 105: Research ProtocolEMS• Pond water-
Page 106 and 107: Pond Water-level Management Scheme1
Page 108 and 109: BlueHybridChannel
Page 110 and 111: Producing Hybrid CatfishFry: Worksh
Page 112 and 113: Multiple-batchProductionFingerlings
Page 114 and 115: Aquaflor ® Approved• Approved by
Page 116 and 117: Aquaflor ® Websitehttp://www.aquaf
Page 118 and 119: AQUAVAC-COLCOLVaccine
Page 120 and 121: Life cycle of Bolbophorus sp.Mature
Page 122 and 123: The “Seine-itizer”
Page 124 and 125: In-Pond (“Heikes(Heikes”) ) Gra
Page 131 and 132: ORGANIC PRODUCTION OFCHANNEL CATFIS
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Dr. Les Torrans - NC Aquaculture Development Conference

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