Common name: White Perch × Yellow Bass
Hydrologic Unit Codes (HUCs) Explained
Puerto Rico &
Interactive maps: Point Distribution Maps
Hybrids of M. americana and M. mississippiensis were first found in 2000 in the middle Illinois River, Illinois (Irons et al. 2002). The following year another 32 specimens were collected.
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Morone americana × mississippiensis are found here.
Table last updated 5/9/2022
† Populations may not be currently present.
Means of Introduction: White perch (M. americana) invaded the native range of yellow perch via the Chicago Shipping Canal from the Great Lakes, where it is also introduced. It gained access to the Great Lakes via the Erie Canal system in New York (see account for white perch).
Status: Established in the middle Illinois River.
Impact of Introduction: Hybridization and competition may represent another threat to the already dwindling yellow bass of that region (Irons et al. 2002).
References: (click for full references)
Irons, K.S., T.M. O'Hara, M.A. McClelland, and M.A. Pegg. 2002. White perch occurrence, spread, and hybridization in the middle Illinois River, upper Mississippi River system. Transactions of the Illinois State Academy of Science 95(3):207-214.
Fact Sheet for Morone americana
- USGS Nonindigenous Aquatic Species Database
Fact Sheet for Morone mississippiensis - USGS Nonindigenous Aquatic Species Database
Revision Date: 5/9/2019
Peer Review Date: 8/20/2004
Fuller, P., 2022, Morone americana × mississippiensis: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2395, Revision Date: 5/9/2019, Peer Review Date: 8/20/2004, Access Date: 5/16/2022
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.