Long-term Survey and Assessment of Large-River Fishes in Illinois, 2020

Research output: Book/Report/Conference proceedingTechnical report


This report presents a summary of those data collected during segment 32 (2020-2021) of the Long-term Survey and Assessment of Large-River Fishes in Illinois (LTEF), an annual survey by members of the Illinois Natural History Survey, with funds administered by the U.S. Fish and Wildlife Service and the Illinois Department of Natural Resources. Sampling for the LTEF program was conducted on six reaches of the Illinois River Waterway and three segments or pools of the lower Mississippi River sampling area. A summary of the Upper Mississippi River data collected for Pools 16-18 as part of F-101-R-31 were reported in DeBoer and Lamer (2021) as part of the F-193-R-07 project report to provide continuity and a comprehensive view of the Upper Mississippi River region. In all segments of the LTEF program, all fish species collected were accurately identified, tallied, measured, and weighed. The catch rates of sportfish species were calculated as the number of individuals collected per hour (CPUEN ± standard error). Structural indices [Proportional Size Distribution (PSD) and Relative Weight (Wr)] were also calculated for several species of interest to regional managers. Catch rates and species varied among all sampling locations and sampling periods. Gizzard Shad and Emerald Shiner comprised the majority of the individuals caught, and Silver Carp and Common Carp accounted for the greatest proportion of the biomass collected in most sampling areas of the survey. Future analysis of CPUEN and PSD trends in sportfish populations sampled by the program may indicate inter-annual recruitment patterns or/and long-term trends in Illinois sportfish populations.
Original languageEnglish (US)
PublisherIllinois Natural History Survey
Number of pages37
StatePublished - 2021

Publication series

NameINHS Technical Report
No.2021 (12)


  • Illinois River
  • Fish population monitoring


Dive into the research topics of 'Long-term Survey and Assessment of Large-River Fishes in Illinois, 2020'. Together they form a unique fingerprint.

Cite this