Abstract
Abstract. The short-term ecological effects of a simulated large-scale regulation release (360 1061d-1), over a 5-day period, from an impoundment into the Afon Vyrnwy were investigated. A dramatic increase in the density and biomass of the fish fauna occurred at the time of the release. Elevated discharge rate was considered the primary factor responsible for the enhancement of the fauna. This increase in density and biomass of the fish fauna was suggested as being the result of fish displaced by tru-released water moving upstream to regain station after the flow had abated. Implications of these observations in the design of operating guidelines for use at regulating reservoirs are discussed.
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