. Bulletin. Natural history; Natural history. 2 l&O-, eo- 1950 1952 1954 1956 1958 BLACK CRAPPIE ^ yeors ^ °1'^ 1954 1956 1958 We did not find that any correlation (;'^â) existed between the growth indices of 3- and 4-year-old white crap- pies and the Lake Chautauqua water levels (Fig. 35). The calculated corre- lation coefficient may be misleading, since more than one age-group was in- volved in the computation. In 1953, a year of low water levels, the 2-, 3-, and 4-year-old fish showed increases in av- erage lengths (Fig. 34). In 1956, a year of low water le
. Bulletin. Natural history; Natural history. 2 l&O-, eo- 1950 1952 1954 1956 1958 BLACK CRAPPIE ^ yeors ^ °1'^ 1954 1956 1958 We did not find that any correlation (;'^â) existed between the growth indices of 3- and 4-year-old white crap- pies and the Lake Chautauqua water levels (Fig. 35). The calculated corre- lation coefficient may be misleading, since more than one age-group was in- volved in the computation. In 1953, a year of low water levels, the 2-, 3-, and 4-year-old fish showed increases in av- erage lengths (Fig. 34). In 1956, a year of low water levels, the 2- and 4-year- old fish showed increases in average Fig. 34.âYear-to-year variations in growth rates (as indicated by length I of 2-, 3-, and 4-year-old white crappies and black crappies at Lake Chautauqua, 1950-1959 (data from Table 15 and Table 18). average length in the fall), and 2-year- old fish continued to show good growth rates each year through 1959. The im- proved growth rates probably were re- lated to the comparatively small popu- lations of crappies present in the lake after 1952. The average lengths of the 3- and 4- year-old white crappies varied less from year to year than the average lengths of the 2-year-olds. After 1956, the average lengths of the 3- and 4-year-old fish de- clined slightly. By 1958 and 1959, the average lengths of fish of these ages had dropped to about where they had been in 1950 and 1951. The length data given here on the 3- and 4-year-old white crappies indicate that the increased re- moval of commercial fishes had no ap- parent beneficial effect on growth of these 1950 10 1952 1954 IMDEX OF GROWTH 1956 1958 -5- â 10- 1950 WHITE' CRAPPIE 3- AND 4-YEAR OLD FISH (till 1952 1954 1956 1958. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. N
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