A Model of the Effects of River Flow Regulation on the Spawning Efficiency of Diadromous Fish

A dynamic control model has been developed to describe the effect of the hydrological regime in a regulated river on the development of diadromous fish populations. Factors taken into account include finiteness of velocity of fish upstream and water downstream movements, nonuniformity of spawning area distribution along the river, riverbed profile, and the influence of water temperature on the spawning process. The model can help to obtain an optimal hydrograph of water outflow through the dam during the spawning period