Abstract: A method for controlling zebra mussels and other bivalves using UV light at a wavelength of 254 nm. One or more low pressure UV lamps provide an intensity of UV light in the range of about 13,400 .mu.W/cm.sup.2 to about 22,300 .mu.W/cm.sup.2 in the water wherein the bivalves may be located. The one or more low pressure UV amps provide a dose of UV light in the range of about 0.08 W.sec/cm.sup.2 to about 2.6 W.sec/cm.sup.2 in the water wherein the bivalves may be located. The dose is provided for a period of time in the range from about 4.5 seconds to about 116 seconds.