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Fish Reports

2004 Report

Pool 26, Upper Mississippi River 2004 Fish Collection Summary

This report is a bullet summary of the Long Term Resource Monitoring Program's (LTRMP) fish collection efforts conducted by the Great Rivers Field Station on Pool 26, Upper Mississippi River during 2004. Information on changes in fish catch over all years can be obtained from the Graphical Fish Database Browser.

• 273 fish collections were conducted using six gear types (Table 2.4), with 263 from randomly selected sites and 12 from a fixed site.

• Main channel border, unstructured; side channel border; and contiguous backwater, shoreline strata received the most sampling effort (Table 2.4).

• In 2004, water levels were lower than normal during April and early May (typically the peak flood period), but considerably higher than normal during late May and June. Water levels did not affect sample allocations; however, data from one small hoop net was lost in period 3 because of an unexplained field computer error (Table 2.4; Figure 1.4).

• 21,807 fish were collected representing 67 species and 3 hybrids (Table 3.4).

• The LTRMP species total for Pool 26 before the 2004 season was 90; no new species were collected in the 2004 season (Table 3.4).

• No Illinois-listed threatened or endangered species were collected (Table 3.4).

• Other species that were collected and are noted as uncommon, rare, or probably strays from tributaries (Pitlo et al. 1995) in Pool 26 were blue sucker, golden redhorse, logperch, redear sunfish, wiper (striped bass X white bass hybrid), slenderhead darter, smallmouth bass, and yellow perch. Mississippi silvery minnow and grass carp were listed as rare and uncommon, respectively by Pitlo et al., but LTRMP collections in Pool 26 since 1995 suggest that their abundance has increased (Table 3.4).

• Mean catch-per-unit-effort and standard error for stratified random and fixed-site sampling for each stratum are shown in Pool 26 tables. Length distributions for selected species of fish are shown in Figures 1 to 17.

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Page Last Modified: April 17, 2018