. Bulletin. Natural history; Natural history. DISCHARGE CANAL (STA 5) INTAKE CANAL (STA I) 1 1 WARM COLO MONTHS - I o < (J 40 -1 30 - 20 - 10 GIZZARD SHAD. UNHEATED ZONE (STA 1,2 & 7) HEATED ZONE (STA 3,4 & 6)^ 1 1 WARM COLD MONTHS ? Fig, 3.—Significant interactions (P < 0.05) between mean catch (kg) of fishes per unit sampling ef- fort at specific heated and unhealed stations in Lal<e Sangchns during warm (July) and cold (January and November) months from 1974 to 1976. Each unit of effort consisted of 1 hour of alternating- current electrofishing, one 24-hour experimental gil
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. Bulletin. Natural history; Natural history. DISCHARGE CANAL (STA 5) INTAKE CANAL (STA I) 1 1 WARM COLO MONTHS - I o < (J 40 -1 30 - 20 - 10 GIZZARD SHAD. UNHEATED ZONE (STA 1, 2 & 7) HEATED ZONE (STA 3, 4 & 6)^ 1 1 WARM COLD MONTHS ? Fig, 3.—Significant interactions (P < 0.05) between mean catch (kg) of fishes per unit sampling ef- fort at specific heated and unhealed stations in Lal<e Sangchns during warm (July) and cold (January and November) months from 1974 to 1976. Each unit of effort consisted of 1 hour of alternating- current electrofishing, one 24-hour experimental gill net set, and four seine hauls months occurred for blackstripe topminnows because they were never collected from any unheated stations. Significant interactions for freshwater drum and red shiner were apparently the result of sampling bias, as very large standard deviations were associated with the mean catches of these species. Red shiners were more abundant in the heated area (Station 4) duringjuly and in an unheated area (Station 7) during the cold months (Fig. 3). Great variation in catches of red shiner occurred because large schools of these minnows were occasionally captured in seine samples. Freshwater drum were more abundant in the intake area (stations 1 and 2) during July and in the discharge arm (stations 4 and 5) during November and Januan, ' (Fig. 3). The large variation in catches of freshwater drum was hypothesized to have occurred because drum were relatively scarce and were usually found in deeper water where they were not I. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division