Welcome to the 369 th annual Aquaculture boot camp

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Juliet Sparks
5 years ago
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1 Welcome to the 369 th annual Aquaculture boot camp

2 In spite of yesterday s gloomy weather. There is sunshine in the future

3 And yes we are on the hunt for #5

5 Famous Emma is everywhere

6 Aeration Choices

7 How Much O2 is necessary? Two Approaches 1) Based on feeding. Dr. Boyd says 1#/ feed requires 1# o2/day. Keeping in mind that fish can consume of to 13x s as much 02 when stomachs are full. 2) Average Consumption method: lbs/ o2/hr/100# s of fish. Oxygen demand in typical fish ponds 50% plankton 30% sediment 20% fish

8 Why Aeration?? Fish: poor growth, habitat, health, fish kills Overproduction of algae Organic sludge accumulation 02 will reduce this Nutrient processing Clarity-plankton, turbidity Debris/trash/surface film Mosquito control Zika, West Nile

9 Water quality & Aeration WHAT AERATION CAN DO Mixes water for uniform distribution of temperatures, ph, nutrients, planktonic food. Fish have full access to the water column When pond mud has oxygen, it buffers the release of phosphorus into the water system. Aerated organic solids have better settlability. Higher oxygen levels stimulate bacteria that consume organic sludge.

11 The quick answer to support aeration is. You do not want to plant your fish

12 Pond aeration two strategies Feed the gain. Aerated to get fish to harvest faster. Shorten the risk. Aerate to increase density and more pounds per acre

13 Oxygen transfer tests 0-98% saturation 20 degrees C Result is lbs/o2/hp/hr. Then.What do you do with that? Does not take into account salinity or altitude. Or the closer you get to saturation the more difficult it is to add oxygen.

14 D.O. Tips Do not let it get below 3 pm at 6 AM - Les Torans research Diurnal fluctuation. Small fish stressed with wide fluctuations Feed conversion gets better as D.O. increases Oxygen reduces the formation of unionized ammonia

15 Pure Oxygen Threshold Somewhere around ½# of fish per gallon of water. Densities as high as 1.9 # of fish per gallon of h20

16 New strategies on some catfish ponds Split ponds with various rpm Up to 20,000 pound/acre Best feed conversions 1.87:1 8 hp/acre Adds.086 cents to production costs per pound cost of production.75. selling price $1.15. average farm size 450 acres $2.2 million profit every 17 months

18 better cheaper

21 Can run in winter but do not shut them off in the extreme north

23 Net pen aquaculture Surface aerators Diffusers

24 Regenerative blower High volume Low pressure

25 Bank of blowers Airstones

29 Deeper ponds Old Style Carbon vanes Noisier Maintenance 10 psi limited More power Better volume

30 New air sources for ponds Quieter Better pressure (deeper and smaller diameter air tubing) Not as much maintenance Not quite the same volume Less amps

31 Linear Compressors Quiet, low amp draw, pressure limited Septic Koi Bait tanks Bio-Assay Labs Lift stations Aquariums Medical Aquaponics

32 Lifting mixing with diffusers 2.5 amps at 120 volts Handles 2 diffusers 3400 gpm per 15 of depth = 9.7 million gallons a day

33 Winterkill prevention 1-2% surface open

34 Diffuser maintenance

35 Pond/lakes stratification Fish kills last summer when we destratified

36 Venturi type causes directional flow

37 De-Icing prevent waterfowl but attract water fowl protect equipment

38 Kasco De-Icers Saved the Day in the Whale Rescue Effort that Inspired the Movie Big Miracle!

39 De-icing

41 Oyster/clam circulation/upweller 1-3 mm seed to field size Reduces predation Circulates more food past them Shaved a year off of production cycle (cost per unit gain was positive)!