. Bulletin. Natural history; Natural history. 951 (157 FISH) no 110 135 \ 145 16, 952 (91 FISH). Fig. 28.—Length-frequency and age distri- bution of white bass in commercial seine hauls at Lake Chautauqua during the month of Sep- tember in 1951, 1952, and 1956. The graphs reveal that the white bass population was dominated by single year-classes. quency study. The length-frequency graphs for the years 1951 and 1952 re- flect the strength of the 1950 year-class and the scarcity of fish of other year- classes. In 1956, the white bass popu- lation was do
. Bulletin. Natural history; Natural history. 951 (157 FISH) no 110 135 \ 145 16, 952 (91 FISH). Fig. 28.—Length-frequency and age distri- bution of white bass in commercial seine hauls at Lake Chautauqua during the month of Sep- tember in 1951, 1952, and 1956. The graphs reveal that the white bass population was dominated by single year-classes. quency study. The length-frequency graphs for the years 1951 and 1952 re- flect the strength of the 1950 year-class and the scarcity of fish of other year- classes. In 1956, the white bass popu- lation was dominated by a single year- class, that of 1954 (Fig. 28). POPULATION DYNAMICS The flow or dynamics of a fish popu- lation is quite complex and diffcult to follow. Certain data presented in pre- ceding sections show that the age com- position of the most abundant species did not remain constant but varied from year to year. They indicate that, like- wise, the spawning success and survival of year-classes of these species varied. This section is cliiefly concerned with the various aspects of population dy- namics dealing with the year-to-year changes in the sizes of populations of the most abundant species. Sampling Techniques The optimum time of sampling, the proper sampling techniques, and the number of samples required to obtain adequate population data had to be de- termined for our study. At the beginning of our study, avail- able data on the water levels of Lake. 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. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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