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the seining operation. Seine samples with small mesh nets along the edge of <br />the lake indicated that bass reproduction was stimulated by the removal of <br />other species but resulted in decreased growth. <br />It was concluded that the commercial seining program was not effective in <br />controlling shad and other rough fish in the large eutrophic lake. The <br />program did indicate that the harvest of fish by large seines had no effect on <br />the catch of sport fish by anglers. However, the experiment was discontinued <br />by the Florida Game and Fresh Water Fish Commission because of adverse public <br />opinion and pressure from anglers. <br />Rose and Moen (1953) reported an increase in game fish populations in East <br />Okoboji Lake, Iowa (1,400 acres, 26 ft. maximum depth) following intensive <br />removal of rough fish. The seining for rough fish in this program was <br />confined entirely to open-water periods, principally in the spring and fall <br />when cool water permitted safe handling of game fishes. Most of the hauls <br />were made with a 2,500 foot, 2 1/2 inch mesh (bar measure) drag seine. A <br />small amount of trap netting and a slight amount of gill netting in the winter <br />was also permitted. <br />Total weight (thousands of pounds) of rough fish removed by seines, traps, and <br />gill nets from East Okoboji, 1940-1950. <br /> YEAR <br />Species 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 <br />Buffalo 262.0 508.9 734.7 361.2 42.3 101.0 99.2 75.4 24.4 18.4 2.4 <br />Carp 32.7 - 91.8 157.7 77.2 30.2 97.7 33.0 43.2 8.8 82.9 47.4 <br />Sheeps- <br />head 68.4 45.4 61.2 30.2 5.4 17.9 5.3 19.2 23.4 2.2 9.7 <br />Total 363.1 646.1 953.6 468.6 77.9 216.6 137.5 137.8 56.6 103.5 59.5 <br />Average catch of rough fish and game fish (pounds per seine haul) in East Okoboji <br />Rough <br />Fish 7,283 4,785 3,808 3,332 2,860 2,558 4,384 2,448 2,115 3,002 2,02 <br />Game <br />Fish 111 39 28 54 69 63 185 631 694 234 697 <br />No. of <br />Hauls 42 106 181 109 20 58 20 48 24 14 26 <br />Average no. of young-of-the-year rough and game fish per seine haul in East Okoboji <br />Rough <br />Fish <br />Game <br />Fish <br />No. of <br />Hauls <br />391 459 317 <br />89 73 159 <br />18 9 9 9 9 8 9 7 4 4 <br />73 13 23 28 5 311 4 <br />1,646 6,241 6,030 5,645 2,558 25,566 5,92 <br />3