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Abstract
A grid that uses 60-Hz, 220-volt single phase electricity was constructed to prevent escapement of nonendemic fish from effluent water. Tests were conducted with initially feeding walleye, Stizostedion vitreum, fry and revealed that a contact time of 0.4 second and an electric potential gradient of 100 volts per 2.5 cm were most effective for preventing fish escapement. The use of 220 volts and grounding plates on entry and exit ends of the grid served as safety measures by maintaining zero net volts to ground in the vicinity surrounding the grid.