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Last modified
7/14/2009 5:02:32 PM
Creation date
6/1/2009 11:22:32 AM
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UCREFRP
UCREFRP Catalog Number
8057
Author
Bennett, J. R., D. A. Krieger, T. P. Nesler, L. E. Harris and R. B. Nehring.
Title
An Assessment Of Fishery Management And Fish Production Alternatives To Reduce The Impact Of Whirling Disease In Colorado.
USFW Year
1996.
USFW - Doc Type
Denver, Colorado.
Copyright Material
NO
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and research hatchery. Operations equaled $133,500 for the research hatchery ($12,000 of this <br />figure was in the form of grant funds) and $198,000 for fish health activities. The rest of the cost <br />was used for personnel services, both permanent and temporary. Warmwater production for 1995 <br />totaled 44.7 million fish or 53,000 pounds (28.9 million inches). Coldwater production for 1995 <br />catchables totaled 4.4 million fish (10.2 inches average per fish), or 1.9 million pounds. <br />Coldwater production for 1995 subcatchables totaled 10.1 million fish (3.3 inches average per <br />fish) or 149,000 pounds. Total coldwater production for 1995 equaled 78.0 million inches. <br />Individual Hatchery Information <br />Specific information on each hatchery concerning location, rearing facilities, water source, <br />personnel, operating costs, disease history, etc., is included in Table 10 and Appendix E. <br />Following is a brief synopsis of options for control of WD or changes in production at each unit. <br />Bellvue Hatchery <br />The Bellvue Hatchery became positive for WD in June 1996. The source of the infection <br />was unknown and only found in the settling ponds below the facility. Due to the physical <br />configuration of the unit (concrete raceways and covered wells), the life cycle of the <br />pathogen can easily be broken. A present proposal is to immediately depopulate the outside <br />rearing containers and dewater the settling ponds. The hatchery building has the potential to <br />be operated as a separate unit, with the discharge water going to the Watson Lake settling <br />ponds. Extensive WD testing on the fish in the hatchery would also have to be performed. <br />The W filter system will help alleviate some of the other fish health problems when the <br />outside raceways are reactivated. The outside rearing basins are covered with birdnetting. <br />The unit is best suited to continue producing subcatchables of various coldwater species <br />based on the limited rearing space and water supply. An oxygenation system could be <br />explored to increase production. <br />Watson Rearing Unit <br />The Poudre River, which is the water supply for the rearing unit, is positive for WD, but the <br />vector of infection is unknown. At present, treating the water supply to try to regain a <br />negative status would not be economically feasible. Personnel at the unit are in the process <br />of covering the raceways with birdnetting; the project is 95% complete. Netting will protect <br />the fish from piscivorous birds, a major source of fish mortality and mode of transportation <br />of the WD parasite. The facility also supplies office space, equipment, and freezer space for <br />the Bellvue Hatchery. Since Watson has historically supplied most of the fish for <br />northeastern Colorado, the additional cost of transporting fish a farther distance might make <br />it feasible to operate Watson in the summer months as a planting base. Watson could also <br />be used as a DOW visitor center since it is close to a large population area and receives an <br />exceptionally large number of visitors each year. Educational material could be provided on <br />all aspects of DOW activities, which might qualify it for GOCO funding; the blueprints have <br />already been drawn. The facility also has the potential to be used for WD research because <br />it is located close to Colorado State University and the future Fish Health Lab (if it is moved <br />to Fort Collins). Since the decision has been made to eliminate production at this facility, <br />the preceding options, plus other options, are currently being evaluated. <br />37
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