This paper is submitted with the objective of providing other fishery investigators with a resume of what has been accomplished in attempting to guide fish by means of subaqueous sonic vibrations. The Fish & Wildlife Service was given the opportunity to test the effects of underwater sound of various frequencies and amplitude on fish. The tests were limited to four undersea warfare sound producing instruments involving three principles of sound production: 1) electromagnetism, 2) Piezoelectricity, and 3) the hydraulic turbine. Because young Pacific salmon were not available at the site, the physiologically similar rainbow and brown trouts were used as experimental animals.