Abstract
Abstract Population estimates of fish in large rivers are scarce, but such information would be extremely useful to evaluate the impact of man's activities on sport and commercial fish in the Missouri River. Winter sampling offered the best opportunity to use multiple-census techniques to estimate populations because of reduced movement of fish and reduced stream flow, thereby concentrating fish in wintering holes. Reliable population estimates were obtained by electrofishing during the winters of 1979-1980 and 1980-1981 in two 16-km study areas of the channelized portion of the river. Estimates and their 95% confidence limits were obtained for common carp (Cyprinus carpio); river carpsucker (Carpiodes carpio); freshwater drum (Aplodinotus grunniens ); goldeye (Hiodon alosoides ); buffalo spp. (Ictiobus spp.); northern pike (Esox lucius); and channel catfish (Ictalurus punctatus). Aside from channel catfish, the total population was estimated to be 2,794 fish per kilometer; the estimated number of channel...
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