DEVICE FOR AERATION OF WATER AND CONCENTRATION OF FISH Russian patent published in 1995 - IPC

FIELD: fish farming. SUBSTANCE: device has turbine with vertical axis of rotation, fixture for forming the flow of aerated water which is made in form of U-shaped casing embracing the turbine whose end wall is formed by vertical partition and unit for regulation of zone of action of aerated water flow and concentration of dissolved oxygen which is arranged in opening of casing and is made in form of perforated damper mounted in grooves whose width is equal to width of opening. Damper is provided with devices for securing it in extreme upper position, extreme lower position and intermediate position. When damper is secured in upper position, its upper edge is located at level of water surface and when it is secured in lower position, this edge is located at depth of turbine. It is good practice to make transverse partition perforated and to mount it in such position that its upper edge should be located at level of water surface. EFFECT: high aeration effect due to avoidance of icing of parts in cold seasons and reduction of operation expenses. 2 cl, 5 dwg