Abstract: An apparatus for selectively aerating a pond. The inventive apparatus preferably includes a first conduit for receiving a fluid from an upper portion of a pond without substantially disturbing a fluid material contained in a lower portion of the pond; a gas delivery conduit for delivering a gas into the apparatus; and a discharge conduit, at least partially positioned in the receiving conduit, for discharging the fluid and the gas into the upper portion of the pond without substantially disturbing the fluid material contained in the lower portion of the pond.