zapped!!!! - rmpc · zapped!!!! background leaburg’s historical trout stocking program produce...
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Seth Morgan & Erik WithalmOregon Department of Fish and Wildlife
Ultraviolet Disinfection At Leaburg Hatchery
ZAPPED!!!!
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BackgroundLeaburg’s historical trout stocking program
Produce 240,000 lbs of rainbow trout400,000 eggs were historically hatched onsite
First IHN outbreak in rainbow trout in 1995Generally follows a major stressor such as transport, grading, fin clipping, or diseaseSource of IHNV is summer steelhead migrating over Leaburg dam, above our water supply
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Leaburg Hatchery Hatch-houseMcKenzie River source waterHeavy silt loads during rain and flood eventsInternal fungus and coldwater disease in fry
High mortalityStressor which can make fry more susceptible to IHN
13 shallow Canadian troughs640 gallons each
2 deep Canadian troughs960 gallons each
Limited well water supply
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Ultraviolet Disinfection SystemIntegrated drum filter with 8 UV lampsRated for 500 gpmFilters water to 25 micronsUV dose of 45,000 µw-sec/cm²254 nm wavelength
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UV System Assembly & Installation
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Seth Morgan
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Jennifer Hulett-Guard
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Tim C. Wright
Ken DanisonDan Murphy
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Supply Pump
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Outflow pumps
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Overhead plumbing
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Microprocessor UV Control Station
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Silt-laden Incoming Water
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Clean, Filtered Outgoing Water
Ultraviolet Lamp Chamber
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Tony AmandiManny Farinas
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Design Considerations Supply Water Overflow
If the filter can’t keep up with the incoming water due to heavy silt loads, the water goes directly through the lamps, bypassing the filter. Therefore, the water won’t be properly disinfected.
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Design Considerations (cont.)Drum Filter LidDuring back wash operations mist containing untreated water could contaminate treated water at the end of UV unit and surrounding fish culture containers.
Rubber flap
Mist
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Price of Clean Water
Cost for base UV system: $42,000$4200 for four 250 gpm pumpsTotal cost of installed system: $50,000Operating cost $10 per day
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Hatch-house MortalityRainbow Trout
0102030405060708090
100
2004 2005 2006 2007 2008
% Mortality
Mortality numbers are expressed as a percent of total rainbow trout inventory in the hatch house.
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Bacteria Counts
0
100
200
300
400
500
600
700
800
Jun-08 Jul-08 Aug-08 Sep-08
Bacteria Colonies - TYE
Pre Filter TYEPost Filter TYE
050
100150200250300350400
Jun-08 Jul-08 Aug-08 Sep-08
Bacteria Colonies - TSA
Pre Filter TSA
Post Filter TSA
Post filter
Pre filter
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Estimated Maximum Capacity
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
25 50 75 100 125
Fish size (Fish/lb.)
Num
ber o
f Fis
h
170,000 fish @ 100 fish/lb.
127,500 fish @ 75 fish/lb.
85,000 fish @ 50 fish/lb.
42,500 fish @ 25 fish/lb.
Assumes a maximum carrying capacity of 100 pounds of fish per shallow trough, which means an instantaneous value of 1,700 pounds of fish total in the hatch-house.
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What We’ve AchievedStill limited to stocking “YES” waterbodiesKeep fish in the hatch-house on clean water longer
Shorter exposure time on McKenzie River waterFish are larger with a more developed immune system before ponding outside in river waterDecreased prevalence of internal fungus and coldwater disease during the fry stage, common stressors that can make the fish more susceptible to IHNV.
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Looking Forward
Whole hatchery UV disinfection system would be optimal. We’ve shown how important a clean or disinfected water supply is to raising healthy fish.