. Bulletin. Natural history; Natural history. Aug. 1981 SuLE ET AL.: Food Habits of Fishes 511 eaten by yellow bass in the rest of the discharge arm. Yellow bass were of similar mean sizes in both arms in 1975, 134 mm and 129 mm for the intake and discharge arms, respectively. The propor- tions of empty stomachs were percent in the intake arm and percent in the discharge arm. Yellow bass were divided into 10-mm size groups in order to examine shifts in feeding associated with fish size (Fig. 5). Zooplankton consumption declined with increasing size, while consumption of Chaoboridae, Ep
. Bulletin. Natural history; Natural history. Aug. 1981 SuLE ET AL.: Food Habits of Fishes 511 eaten by yellow bass in the rest of the discharge arm. Yellow bass were of similar mean sizes in both arms in 1975, 134 mm and 129 mm for the intake and discharge arms, respectively. The propor- tions of empty stomachs were percent in the intake arm and percent in the discharge arm. Yellow bass were divided into 10-mm size groups in order to examine shifts in feeding associated with fish size (Fig. 5). Zooplankton consumption declined with increasing size, while consumption of Chaoboridae, Ephemeroptera, and fish increased with increasing yellow bass size. This shift to larger prey items at the larger fish sizes, which was similar to that found for stunted populations of yellow bass in Iowa (Kutkuhn 1954, Collier 1959, Ridenhour 1960, Kraus 1963, and Welker 1963), occurred in both arms but was most pronounced in the intake arm. In the discharge arm, although yellow bass consumption of zooplankton declin- ed as yellow bass grew, zooplankton still dominated the food base of even large 20H â¡ = INTAKE â = DISCHARGE XL 20- EPHEMEROPTERA J] ^ Jl H _a. 20- CHAOBORIDAE lOOn Fig. 6-âAverage weight percentages of major foods found in yellow bass from tfie intake and discfiarge arms of Lake Sangcfiris during dif- ferent months of 1974 and 1975. CHIRONOMIDAE LJJ H ZOOPLANKTON LiJ 5 11 104 25 N-INTAKE 62 53 46 24 68 17 N-DISCHARGE JAN FEB MAR APR MAY JUNE JUL AUG SEPT OCT NOV. 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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