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<br />4. Electric fences. <br /> <br />5. Manipulation of water levels. <br /> <br />6. New pond designs. <br /> <br />7. Combinations of the above. <br /> <br />Table 3 lists facilities and the control measures they used <br />through 1989. <br /> <br />Table 3. Measures used to control predators at ODFW hatcheries <br />in 1989. Frightening devices are used to scare predators from <br />their prey. Physical controls serve to prevent predators from <br />reaching their prey. <br /> <br />Facility <br /> <br />Control measure <br /> <br />Physical control <br /> <br />Frightening device <br /> <br />Alsea <br /> <br />Bandon <br /> <br />Big Canyon <br />Big Creek <br /> <br />Bonneville <br /> <br />Butte Falls <br /> <br />Cascade <br /> <br />Cedar Creek <br /> <br />Clackamas <br />Cole Rivers <br /> <br />Dexter <br /> <br />Elk River <br /> <br />Cracker shells <br /> <br />Cracker shells <br /> <br />Cracker shells <br />Cracker shells, <br />Alarm or distress calls, <br />Automatic exploders <br />All frightening devices <br />have been used except <br />water spray <br />Cracker shells <br /> <br />Cracker shells, Lights, <br />Balloons, Total darkness <br />Cracker shells, <br />Whistlers; <br />Automatic exploders, <br />Drop lights on timers <br />Cracker shells <br />Cracker shells <br /> <br />Cracker shells, Lights, <br />Alarm or distress calls, <br />Balloons, Scarecrows <br /> <br />8 <br /> <br />Water level <br />manipulation <br />Nets, Water level <br />manipulation <br /> <br />Lines <br /> <br />Screen from <br />handrail <br />Water level <br />manipulation <br />Lines, Electric <br />fence <br /> <br />Screens, Water <br />level <br />manipulation <br />Lines. <br /> <br />Nets <br />