Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
Home | Intranet | Digital Measures | Help

Evaluation of natural and hatchery-produced kokanee in Flaming Gorge Reservoir


July 2019 - June 2020


Stocking fishes has long been a critical component of effective fisheries management. Stocking practices are generally considered as belonging to one of three major categories. Introductory stockings occur when a species is stocked to establish a population in a waterbody. Although introductory stockings were once commonplace, today they are typically limited to conservation actions where populations are being reestablished following local extirpation. More common are maintenance and supplementary stockings. Maintenance stocking is used when natural production is absent and recurrent stockings are necessary to maintain a population. Supplemental stocking occurs when managers deem natural production of fish to be insufficient to meet management goals. As the name implies, hatchery fish are stocked to supplement natural production. Supplemental stockings are particularly common and although the concept is simple, the contribution of hatchery fish to the population and to the recreational creel is often unknown. The production of hatchery fish is costly and stocking fish in one waterbody circumvents stocking those same fish in another system. As such, ensuring that hatchery fish are used effectively and efficiently is critically important. One system where contributions of supplemental stocked fish have come into question is Flaming Gorge Reservoir (FGR), Wyoming-Utah.


Current Staff

Federal Staff: 3

Masters Students: 11

Phd Students: 4

Post Docs: 0

University Staff: 5

5 Year Summary

Students graduated: 28

Scientific Publications: 100

Presentations: 250



Funding Agencies

  • Wyoming Game and Fish Department


Idaho Cooperative Fish and Wildlife Research Unit Cooperators

  1. Idaho Department of Fish and Game
  2. U.S. Fish and Wildlife Service
  3. U.S. Geological Survey
  4. University of Idaho
  5. Wildlife Management Institute