Upper Midwest Environmental Sciences Center
Pool 8, Upper Mississippi River 2006 Fish Collection Summary
This report is a bullet summary of the Long Term Resource Monitoring Program's (LTRMP) fish collection efforts conducted by the Onalaska Field Station on Pool 8, Upper Mississippi River during 2006. Information on changes in fish catch over all years can be obtained from the Graphical Fish Database Browser.
- 180 fish collections were conducted using 6 gear types (Table 2.2). Of the 180 collections, 160 were from randomly selected sites. Twenty collections were made at fixed TWZ sites.
- Water levels did not affect sampling allocations or activities. Although the April and May peaks were slightly above average, water levels were below or well below normal for the entire second half of the year (Figure 1.2).
- Backwater, main channel border-unstructured, and side channel border
strata strata received the most sampling effort (Table 2.2).
- 23,002 fish were collected representing 53 species and 2 hybrids (Table 3). This total includes 194 unidentified sunfishes (Centrarchidae) and 1 unidentified catfish (Ictaluridae) less than 30 mm long (Table
3.2).
- Historical fish distribution records for the Upper Mississippi River (Pitlo et al. 1995) document 99 fish species from Pool 8.
- The LTRMP species total for Pool 8 before the 2006 season was 90; no new species were added to this total since 1997.
- Several species were collected that are listed on Wisconsin’s rare fish list, including the following: 2 mud darters (special concern), 73 pugnose minnows (special concern), 3,576 weed shiners (special concern), 1 western sand darter (special concern), and 17 river redhorse (threatened) (Table 3.2).
- Mean catch-per-unit-effort and standard error for fish collected
using stratified random and fixed-site sampling for each stratum are
shown in Pool 8 tables.
Length distributions for selected species of fish are shown in Figures 1
to 17.
Content manager: Jennie
Sauer
Page Last Modified: April 17, 2018