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MECHANICAL FISH CONTROL <br />EFFECTIVENESS OF BULLHEAD REMOVAL <br />WITH FYKE NETS <br />170 <br />160 <br />150 <br />140 <br />130- <br />120- <br />110 <br />z 100 <br />or 90 <br />w <br />Q- 80 <br />uj <br />w 70 <br />co <br />2 60- <br />D <br />z 50 <br />40 <br />30 <br />20 <br />10 <br />0 <br />0 <br />SOURCE: HANSON ET AL. (1983) <br />n <br />1 2 3 4 5 6 <br />`CUMULATIVE CATCH (Thousands)