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Enhancing Fish Health with UV Disinfection at Lookingglass Hatchery

Learn about the implementation and effectiveness of UV water treatment at Lookingglass Hatchery to improve fish health. Discover maintenance practices, related expenses, and the impact on disease prevention. Explore bacterial testing procedures and the system's impact on water quality and fish health.

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Enhancing Fish Health with UV Disinfection at Lookingglass Hatchery

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    1. Effectiveness of Lookingglass Hatchery UV Disinfection Water System Sam Onjukka, ODFW Fish Health Services And Diane Deal, Assistant Mgr. Lookingglass Hatchery

    2. Lookingglass Fish Hatchery Came on-line in 1982 1999 a study conducted by Dr. Warren Groberg, Sam Onjukka & others, recommended developing a pathogen free water supply for LGH for disease management

    3. Ultraviolet System = UV System Went on-line in March, 2006 Drum Filter UV Shell/UV lights Inlet/Outlet Weir Boxes Gravity flow = Very simple and effective system Original Cost, $285,000 = UV System & Building

    4. Part 1 -Maintenance Weekly = Check spray bar nozzles Hourly = Lube drum filter, two bogie wheels and zirks Monthly = Clean lamps, spray bar filter every other month Yearly = all other service once a year which includes changing bulbs, cleaning crystals, pressure washing, filter cleaning, etc. Maintain a Maintenance Log

    5. Part 1 – Related Expenses July, 2007 Prices Filter Panels = $186.00 each Screen Patching Plugs = $1.28 each O-Rings = $4.00 a pack of 10 Nozzles = $4.50 each UV Lamps = $100.00 each UV Crystals = $100.00 each Complete back-up sets are kept on station

    6. Maintenance Log

    7. Back-Up System July 2007 Quote Cost = $14,323.18 Additional 14 lamps with Quartz sleeves & insert kit, and Control panel = additional dosage or back-up in case of lamp/panel failure

    8. Natural Rearing can now be accomplished because of the UV Treated water All of Lookingglass Hatchery’s program is being reared at the facility Frees up facilities that were rearing our fry, for other programs Cost effective – chiller’s are shut down as soon as we can put eggs on UV treated creek water – Well water supplementation becomes < 25% and more water is available for de-icing the Intake Daily electrical cost, UV = $2.86/day, Chiller = $8.03 day, Well $215.37/day per 2007 rates

    9. Part 2 – Fish Health & Effectiveness of Lookingglass Hatchery’s UV disinfection water system Less Pathogen load Better water quality = Better Fish Health

    10. Effectiveness of Lookingglass Hatchery UV Disinfection Water System Bacterial counts in Pre and Post UV treated Water Sam Onjukka ODFW – Fish Health Services Eastern Oregon University, La Grande, Oregon Diane Deal ODFW - Lookingglass Hatchery

    11. Fish Health Recommendations to Reduce the Incidence and Severity of Disease (2002)

    12. Lookingglass Hatchery UV System Flow vs. Dose Relationship

    13. Effectiveness of the UV System Measured by a reduction in total bacterial counts in post UV treated water as compared to raw Lookingglass Creek water = pre UV treated water

    14. Bacterial Testing Procedure Water samples collected in sterile containers, kept dark on ice. Each sample diluted 10 fold in sterile 0.5% NaCl 0.1 ml of each sample and dilution plated onto Tryptone Yeast Extract agar (TYE-S) agar plates in replicate and spread with a flame sterilized glass hockey stick. Plates incubated at 18 C for 7 days. Bacterial colonies counted and original concentration in original sample calculated (colony forming units per ml = cfu/ml).

    18. Bacterial Counts in Pre and Post-UV Treated Water at Lookingglass Hatchery in 2006-2007

    20. Bacterial Counts in Lookingglass Creek Water Above Lookingglass Hatchery Intake

    21. Bacterial Counts in Pre and Post-UV Treated Water at Lookingglass Hatchery in 2007-2008

    22. Summary Total bacterial counts were useful in measuring the effectiveness of the UV system – once methods and sample locations were worked out. The UV system appears to be effective at reducing 99% or more of the total culturable bacteria with lower flow rates (up to ~250-300 GPM) but there is concern as flows increase. February 2008 results showed 92.7% reduction with 680 GPM. The apparent slightly reduced effectiveness of the UV system at higher flow rates raises some concern for the protection of production fish from pathogens shed in the water supply by passed adults or naturally reared fish. UV treated water is only for early rearing. Once fish are ponded in outside raceways (April or early May) they have 10 months or more of rearing on raw Lookingglass Creek water. Monitoring the UV system & fish health over time will make it clearer just how effective the system will be.

    23. Any advantage we give the fish, from egg to adults = this is the result, Yes!

    24. Thanks to everyone who has made this program a success

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