. Bulletin. Natural history; Natural history. 70 Illinois Natural History Survey Bulletin Vol. 29, Art. 1 100-. 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 I9601961 Fig. 30.—Species composition of fish in the anglers' catches at Lake Chautauqua, 1941 — 1961. The graph, which is based on numbers of fish, gives evidence that the adult populations of crappies, bluegills, and yellow bass fluctuated widely in the 21-year period. nated the catch. Fishing conditions un- doubtedly had some effect on the spe- cies composition shown in the graph; howeve
. Bulletin. Natural history; Natural history. 70 Illinois Natural History Survey Bulletin Vol. 29, Art. 1 100-. 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 I9601961 Fig. 30.—Species composition of fish in the anglers' catches at Lake Chautauqua, 1941 — 1961. The graph, which is based on numbers of fish, gives evidence that the adult populations of crappies, bluegills, and yellow bass fluctuated widely in the 21-year period. nated the catch. Fishing conditions un- doubtedly had some effect on the spe- cies composition shown in the graph; however, anglers at the lake usually fished for the species that were abun- dant, and upon this basis we believe that the graph gives a fairly accurate picture of the natural fluctuations in abundance of the sport fishes of catch- able sizes. Bluegill and Yellow Bass: Popula- tion Changes. — The catch data pre- sented in Table 40 indicate that the adult bluegill population of Lake Chau- tauqua was larger in the 1954-1959 pe- riod than at any other time during the study. During much of this period of high bluegill population, the crappie and yellow bass populations were com- paratively low (Fig. 30). Over most of this period, the yellow bass population was evidently increasing in size and in 1961 it was large enough to dominate the anglers' catch. White Bass : Population Changes.— The tagging studies at Lake Chautau- qua indicated that the white bass pop- ulation was quite mobile. During pe- Table 40.—Data relative to the anglers' catch of bluegills at Lake Chautauqua in the period 1950-1959. Average Average Pounds Caught Number Catch Per Catch Average Weight and Removed Year Caught Fisherman- Per in Pounds Per Acre of Day Hour Water 1950 7,626 1951 9,335 1952 8,316 1953 1,680 1954 15,787 0,20 1955 21,838 1956 18,892 2,1 1957 22,220 1958 23,4
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