Spring water level stabilization and relationships between hydrologic, biologic, and fishery characteristics of TVA reservoirs. Review of existing data: Summary report and recommendations, Phase one of the fish spawning task team.

摘要

Reservoir operations and annual variation in hydrology result in substantial fluctuations of water level within impoundments. Since the 1950s, TVA has attempted to stabilize tributary reservoir pool levels for a two-week period when water temperatures reach 65(degree)F at a depth of five feet. These conditions approximate the peak spawning season for largemouth bass, an important sport fish of the Tennessee River Valley. The current water level stabilization program was established to benefit largemouth bass. However, the benefits of the current spring stabilization procedures accrue, not to bass, but to another important sportfish, the white crappie. An earlier stabilization period would likely be of even greater benefit to white crappie. Phase-two of this project will provide a more detailed evaluation of the effects of timing and duration of spring water level stabilization and allow us to recommend specific optimizing modifications. Pending these recommendations, the water level stabilization program should continue as implemented.