Effect of the Operation of Kerr and Hungry Horse Dams on the Reproductive Success of Kokanee in the Flathead System; Technical Addendum to the Final Report.
This addendum to the Final Report presents results of research on the zooplankton and fish communities of Flathead Lade. The intent of the Study has been to identify the impacts of hydroelectric operations at Kerr and Hungry Horse Dam on the reproductive success of kokanee an to propose mitigation for these impacts. Recent changes in the trophic ecology of the lake, have reduced the survival of kokanee. In the last three year the Study has been redirected to identify, if possible, the biological mechanisms which now limit kokanee survival, and to test methods of enhancing the kokanee fishery by artificial supplementation. These studies were necessary to the formulation of mitigation plans. The possibility of successfully rehabilitating the kokanee population, is the doubt because of change in the trophic ecology of the system. This report first presents the results of studies of the population dynamics of crustacean zooplankton, upon which planktivorous fish depend. A modest effort was directed to measuring the spawning escapement of kokanee in 1988. Because of its relevance to the study, we also report assessments of 1989 kokanee spawning escapement. Hydroacoustic assessment of the abundance of all fish species in Flathead Lake was conducted in November, 1988. Summary of the continued efforts to document the growth rates and food habits of kokanee and lake whitefish are included in this report. Revised kokanee spawning and harvest estimates, and management implications of the altered ecology of Flathead Lake comprise the final sections of this addendum. 83 refs., 20 figs., 25 tabs.
- Research Organization:
- Montana Department of Fish, Wildlife and Parks
- Sponsoring Organization:
- United States. Bonneville Power Administration.
- DOE Contract Number:
- 1986BP39641
- OSTI ID:
- 6842435
- Report Number(s):
- DOE/BP-39641-6; R&D Project: 198110500; ON: DE90011832
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of the Operation of Kerr and Hungry Horse Dams on the Reproduction Success of Kokanee in the Flathead River System, 1986 Annual Progress Report.
Impacts of Water Level Fluctuations on Kokanee Reproduction in Flathead Lake; Effects of Operation of Kerr and Hungry Horse Dam on Reproductive Success, 1983 Annual Report.
Related Subjects
54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
ANADROMOUS FISHES
BASELINE ECOLOGY
HYDROELECTRIC POWER
BIOLOGICAL EFFECTS
ENVIRONMENTAL IMPACTS
ZOOPLANKTON
POPULATION DYNAMICS
DAMS
GROWTH
LIFE CYCLE
MIGRATION
MONTANA
MORTALITY
PROGRESS REPORT
REPRODUCTION
RIVERS
SALMON
ANIMALS
AQUATIC ORGANISMS
DOCUMENT TYPES
ECOLOGY
ELECTRIC POWER
ENERGY SOURCES
FEDERAL REGION VIII
FISHES
NORTH AMERICA
PLANKTON
POWER
RENEWABLE ENERGY SOURCES
STREAMS
SURFACE WATERS
USA
VERTEBRATES
Kokanee salmon - Montana - Flathead Lake - Reproduction
130600* - Hydro Energy- Environmental Aspects
540310 - Environment
Aquatic- Basic Studies- (1990-)
550100 - Behavioral Biology