Master of Science (MS)
Semester of Degree Completion
Foods and diel feeding activities of the redfin shiner, Notropis umbratilis, were studied in Coles County, Illinois in September, 1981, and monthly from April through September, 1982. A total of 200 stomachs with food were examined. Diptera adults and larvae were the most frequently occurring food item (83%), and also occurred in the highest volume (49%). Coleoptera were the second most frequently occurring item (23%), and accounted for the second largest volume (11%). Larger fish consumed a wider variety of food items. Changes in foods with season were also noted.
Feeding activity on the 24-25 July was greatest in the evening (1930-2330 hrs.) and shortly after sunrise (0530 hrs.). Ephemeroptera, Coleoptera, and Hymenoptera were important items in the diet in the late afternoon. Diptera were the dominant order after dark and again at dawn.
The redfin shiner was found to be an opportunistic feeder, utilizing those foods that are most abundant and easily obtained.
High, Karen Denise, "Foods and Feeding of the Redfin Shiner (Notropis umbratilis) in Coles County, Illinois" (1982). Masters Theses. 2951.