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Fish Reports

2002 Report

La Grange Pool, Illinois River 2002 Fish Collection Summary

This report is a bullet summary of the Long Term Resource Monitoring Program's (LTRMP) fish collection efforts conducted by the Havana Field Station on La Grange Pool, Illinois River during 2002. Information on changes in fish catch over all years can be obtained from the Graphical Fish Database Browser.

• 402 fish collections were conducted using six gear types (Table 2.6).

• Water levels did not affect sample allocations.  All gear allocations were completed among strata for all three sampling periods (Table 2.6; Figure 1.6).

• Two TWZ sites were sampled, La Grange Lock and Dam and Peoria Lock and Dam; data from both TWZ sites were combined for analysis (Table 2.6).

• Side channel border; main channel border, unstructured; and backwater, contiguous-shoreline strata received the most sampling effort (Table 2.6).

• 270,905 fish were collected representing 67 species and 4 hybrids. This is the largest annual LTRMP catch to date (Table 3.6).

• Fish distribution records for La Grange Pool of the Illinois River (Smith 1979) document 115 fish species from La Grange Pool.

• The LTRMP species total for La Grange Pool collected by LTRMP through 2002 is 85 species and 9 hybrids; blue sucker and pumpkinseed x bluegill hybrids were collected for the first time in 2002 (Table 3.6).

• Gizzard shad, unidentified clupeids, and threadfin shad catches accounted for 82% of the total catch in 2002.

• 8 non-native species (and 3 non-native hybrids) have been collected by LTRMP monitoring of La Grange Pool; of these, only striped bass were not collected in 2002.

• No federal or state threatened or endangered species have been collected by LTRMP monitoring of La Grange Pool.

• Mean catch-per-unit-effort and standard error for fish collected by gears using stratified random (Tables 4.6-11.6) and fixed-site sampling (Tables 14.6-21.6) for each stratum are shown.

• Length distributions for selected species of fish are shown in Figures 2.6 to19.6.