 As of 2020 Thames Water are reviewing the access arrangements for all three of the Walton reservoirs, The design of the reservoir has an effect on the fish population that can live in the reservoir, the concrete shores means that only European perch and ruffe can breed, except for where there are empty fish cages constructed with netting, which support some plant growth and this allows small numbers of cyprinid fish to breed.The low numbers of fish in the reservoir have led to the zooplankton being dominated by large sized cladocerans and "Daphnia" and to high growth rates in the few fish that live there.No fishing is permitted at the reservoir.