THE STATUS OF NEBRASKA FISHES IN THE MISSOURI RIVER, 5. SELECTED CHUBS AND MINNOWS (CYPRINIDAE): SICKLEFIN CHUB (MACRHYBOPSIS MEEKl), STURGEON CHUB (M. GEUDA), SILVER CHUB (M. STORERIANA), SPECKLED CHUB (M. AESTIVAUS), FLATHEAD CHUB (PLATYGOBIO GRACILIS), PLAINS MINNOW (HYBOGNATHUS PLACITUS), AND WESTERN SILVERY MINNOW (H. ARGYRITIS)
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Seven species of native Missouri River cyprinids have been reduced in abundance by 70 to 98%. Several have been extirpated from the reach upstream from Gavins Point Dam. The reasons for the decline are most likely the alteration of sediment dynamics due to dam construction, the elimination of bankful discharge, and the elimination of critical habitats, such as sandbars and off-channel areas.