Ecology of Fundulus catenatus in Three Interconnected Stream Orders

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Abstract
F. catenatus, the northern studfish, was studied in tributaries of the Green River, Casey County, Kentucky [USA]. Spawning occurred from April through July when males are in breeding color. Many studfish live for over 3 yr and attain lengths of 85-115 mm. Peak feeding occurred in the morning and late afternoon. Most food items were taken from the substrate and water column of the stream. Immature and adult diptera were the most important foods eaten by all age groups during autumn, spring and summer months. Important food items consumed by age 0 fish included crustaceans, Hydrocaria, rotifers, gastropods, nematodes and Hymenoptera. Major food items eaten by older fish are Ephemeroptera nymphs, Trichoptera, Coleoptera adults, nematodes and Hymenoptera. Studfish disappeared from the collection sites in late autumn and returned in April.

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