flow of water from dam to river with fish

water dam river hydropower fish energy ecosystem flow aquatic life production interaction preservation surface stream nature environment wildlife power movement currents hydro technology ecology reservoir salmon trout energyproduction waterflow fishlife riverlife wildlifeconservation sustainability greenenergy natureconservation riverdam waterinteraction damimpact aquaticpreservation hydropowerimpact rivercurrent energyefficiency aquaticlife waterstream ecofriendly riverecosystem naturepreservation environmentprotection dynamic showing highlighting