Spatial and Temporal Variability of Channel Catfish Populations in the Upper Mississippi River System.
ILLINOIS NATURAL HISTORY SURVEY HAVANA
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One application of Long Term Resource Monitoring Program LTRMP data is to evaluate long term trends in channel catfish Ictalurus punctatus Rafinesque 1818 populations. This species is an important component of the Upper Mississippi River System UMRS fish community because it is numerally abundant, it comprises a significant portion of the total fish biomass, and it is avidly sought by both sport anglers and commercial harvesters. Since 1989, biologists at the LTRMP Field Stations have monitored fish population and community structure at six pools and in multiple aquatic habitat types of the UMRS. These pools include the tailwater, impounded, side channel, main channel, and backwater habitats defined by navigation lock and dam 4, 8, 13, and 26 of the Mississippi River the Open Mississippi River near Cape Girardeau, Missouri and La Grange Pool of the Illinois River near Havana, Illinois. Both Pool 26 at Alton, Illinois and La Grange Pool Field Stations are operated by the Illinois Natural History Survey INHS.