USGS Home
Contact USGS
Search USGS

Fish Reports

2001 Report

Pool 26, Upper Mississippi River 2001 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 2001. Information on changes in fish catch over all years can be obtained from the Graphical Fish Database Browser.

• 383 fish collections were conducted using 10 gear types (Table 2.4).
  
  
• Water level extremes resulted in one missed mini fyke in period 1, two missed mini fykes in period 2, and one day electrofishing in period 3. One large hoop net was apparently stolen during period 3 resulting in an additional missed sample (Table 2.4; Figure 1.4).
  
  
• Effort was reallocated slightly for 2001 to gain greater statistical power. Two large and small hoop net collections in the backwater contiguous open stratum and two in the impounded open stratum were redirected to side channel border and main channel border unstructured strata. In addition, two fyke net collections in the side channel border stratum were redirected to the impounded shoreline stratum.
  
  
• Of the 383 fish collections, 365 were from randomly selected sites. Eighteen collections were made at fixed sites.
  
  
• Main channel border, unstructured; side channel border; and backwater, contiguous, shoreline strata received the most sampling effort (Table 2.4).
  
  
• 19,417 fish were collected representing 63 species and 2 hybrids (Table 3.4).
  
  
• Fish distribution records for the Upper Mississippi River document 99 fish species from Pool 26 (Pitlo et al. 1995).
  
  
• The LTRMP species total for Pool 26 before the 2001 season was 88; no new species have been added to this total since 2000.
  
  
• Two lake sturgeon (Illinois-listed endangered species) were collected, and no Illinois threatened species were collected (Table 3.4).
  
  
• Mean catch-per-unit-effort and standard error for fish collected by gears using stratified random (Tables 4.4-13.4) and fixed-site sampling (Tables 15.4-21.4) for each stratum are shown.
  
  
• Length distributions for selected species of fish are shown in Figures 2.4 to 19.4.
  

Content manager: Jennie Sauer