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MECHANICAL FISH CONTROL <br />COMPETITION BETWEEN WHITE SUCKERS AND WALLEYE <br />606 ACRE NORTHEASTERN MINNESOTA LAKE <br />POPULATION ESTIMATE OF WHITE SUCKERS: 6,174 <br />SUCKERS EXTREMELY ACTIVE ON SPAWNING SHOALS <br />ONE TIME REMOVAL USING MINNESOTA TRAP NETS WITH <br />50-FOOT LEADS <br />SPRING 1966: 5,369 SUCKERS, 15,567 LBS. <br />POPULATION REDUCTION EFFECTIVE FOR 5 YEARS <br />JUVENILE SUCKERS BEGAN TO INCREASE IN <br />YEAR 6 <br />WALLEYE ANGLING YIELD <br />PRIOR TO SUCKER REMOVAL 3.0 KG/HA <br />AVERAGE AFTER SUCKER REMOVAL 4.9 KG/HA <br />INCREASE GROWTH OF WALLEYE INITIALLY; <br />SUBSEQUENTLY DECREASED WITH INCREASE IN <br />WALLEYE POPULATION DENSITY <br />REMOVAL OF SUCKERS WITH NETS FEASIBLE WHEN: <br />SUCKERS ARE DOMINANT <br />HIGH PROPORTION CAN BE REMOVED <br />FEW OTHER FISH SPECIES PRESENT TO USE <br />AVAILABLE FOOD RESOURCES <br />SOURCE: JOHNSON (1975) <br />22