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MECHANICAL FISH CONTROL <br />SUCKER POPULATION AFTER REMOVAL BY TRAP NET ' <br />80 - Spring Trapnet <br />N <br />u 70 <br />M <br />B <br />E 60 <br />R <br /> <br />L 50 <br />I <br />F <br />T 40 <br />30 <br />20 <br />10 <br /> <br />SOURCE: JOHNSON (1975) 24 <br />64 65 66 67 68 69 70 71 72 73 <br />Year (19)