Review of the Effects of Water-Level Changes on Reservoir Fisheries and Recommendations for Improved Management.

摘要

This report synthesizes and summarizes information gathered from available sources about the physicochemical and biological effects of water-level changes on reservoir ecosystems. It describes how variations in both the physical environment (i.e., basin morphometry, bottom substrates and structures, erosion, turbidity, temperature, and water-retention time) and the chemical environment (i.e., nutrients and dissolved oxygen) caused by water-level changes can directly influence a reservoir's production of fish. It also describes the complex ways in which water-level changes affect aquatic plants, zooplankton, and the benthos and how these trophic variations can eventually affect the growth, reproduction, and harvest of fish. The final part of the report summarizes the effects of drawdown and flooding on reservoir fish populations and recommends ways to manage reservoir fluctuation zones by making controllable variables as favorable as possible for fish survival, spawning, and feeding. (Author)