. Bulletin. Natural history; Natural history. 86 Illinois Natural History Survey Bulletin Vol. 30, Art. 2 Table 8. — Length and weight increments over three seasons, 1961-1963, and final average coefficients of condition for the dominant 1958 year-class of smallmouth bass in ponds Sigma, Tau, and Upsilon. Pond Average Length Average Weight Increment, Inches Increment, Pounds Final Average Condition (C) bigma Tau Upsilon Control Cropped Add-stoek history in ponds Sigma, Tau, and Up- silon (Fig. 3). Again growth and condi- tion were computed from the sam
. Bulletin. Natural history; Natural history. 86 Illinois Natural History Survey Bulletin Vol. 30, Art. 2 Table 8. — Length and weight increments over three seasons, 1961-1963, and final average coefficients of condition for the dominant 1958 year-class of smallmouth bass in ponds Sigma, Tau, and Upsilon. Pond Average Length Average Weight Increment, Inches Increment, Pounds Final Average Condition (C) bigma Tau Upsilon Control Cropped Add-stoek history in ponds Sigma, Tau, and Up- silon (Fig. 3). Again growth and condi- tion were computed from the same samples. While mid-season samples were in some cases quite small, and a source of some error, those collected at the beginning and end of each season were large and believed to be highly representative. Because of initial overstocking of all three ponds with approximately 130 pounds per acre, growth was negligible, conditions remained poor, and the influence of the experimental treatment was only barely discernible in 1961. All three popula- tions were heavily and equally thinned in early 1962, and the effects of subse- quent cropping and transfer of stocks became increasingly apparent through- out 1962 and 1963. The degree of conformity between the growth and condition curves indi- cates that for the 1958 year-class in Unit 4 ponds there was a rather close relationship between rate of growth and body condition, with fastest growth as- sociated with best condition, and vice versa. The most dramatic response to population manipulation occurred among the dominant 1958 year-class in pond Upsilon. Average condition for these fish declined from in April, 1961, to in the following Septem- ber, due to increased density of stock. n 0 U) I . z lao- z • I 'o Ul IQO- _l o 1- ao-. T 1 1 r T 1 1 r. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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