Mark R. Sadzikowski, Dale C. Wallace, A Comparison of the Food Habits of Size Classes of Three Sunfishes (Lepomis macrochirus Rafinesque, L. gibbosus (Linnaeus) and L. cyanellus Rafinesque), The American Midland Naturalist, Vol. 95, No. 1 (Jan., 1976), pp. 220-225
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Sadzikowski et al. (1976) studied this question.