The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Micropterus henshalli
Micropterus henshalli
(Alabama Bass)
Native Transplant

Copyright Info
Micropterus henshalli Hubbs and Bailey, 1940

Common name: Alabama Bass

Taxonomy: available through www.itis.govITIS logo

Size: Up to 24 in. (61 cm) (Page and Burr 2011).

Native Range: Mobile Bay basin in Mississippi, Alabama, and Georgia (Page and Burr 2011).

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

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 Micropterus henshalli are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
AL201520151Middle Chattahoochee-Lake Harding
CA197320002San Jacinto; Upper San Joaquin
GA197020154Hiwassee; Tugaloo; Upper Chattahoochee; Upper Ocmulgee
TN201520226Holston; Lower Little Tennessee; Middle Tennessee-Chickamauga; Ocoee; Upper Clinch, Tennessee, Virginia; Watts Bar Lake
TX199620181Double Mountain Fork Brazos

Table last updated 6/16/2024

† Populations may not be currently present.

Ecology: Flowing pools of small to medium rivers and also impoundments (Page and Burr 2011).

Impact of Introduction: A population of M. henshalli introduced into Keowee Reservoir, South Carolina, has been documented hybridizing with native Redeye Bass (M. coosae). This hybridization and subsequent introgression is probably the reason for the decline of Redeye Bass population in Keowee Reservoir (Barwick et al. 2006).

Remarks: This bass was formerly a subspecies, M. punctulatus henshalli. It was recently elevated to a full species (Page et al. 2013).

References: (click for full references)

Barwick, D.H., K.J. Oswald, J.M. Quattro, and R.D. Barwick. 2006. Redeye bass (Micropterus coosae) and Alabama spotted bass (M. punctulatus henshalli) hybridization in Keowee Reservoir. Southeastern Naturalist 5(4): 661-668.

Lee, D. S., C. R. Gilbert, C. H. Hocutt, R. E. Jenkins, D. E. McAllister, and J. R. Stauffer, Jr.  1980.  Atlas of North American Freshwater Fishes.  North Carolina State Museum of Natural History.  Raleigh, NC.  854 pp.

Page, L.M., and B.M. Burr. 2011. Peterson Field Guide to Freshwater Fishes of North America North of Mexico. Second Edition, Houghton Mifflin Harcourt, New York, New York, 663 pp.

Page, L.M., H. Espinosa-Perez, L.T. Findley, C.R. Gilbert, R.N. Lea, N.E. Mudrak, R.L. Mayden, and J.S. Nelson. 2013. Common and Scientific Names of Fishes from the United States, Canada, and Mexico. Seventh Edition. American Fisheries Society Special Publication 34, Bethesda, Maryland. 384 pp.

Other Resources:
FishBase Summary

Author: Benson, A.J.

Revision Date: 6/17/2019

Peer Review Date: 5/16/2014

Citation Information:
Benson, A.J., 2024, Micropterus henshalli Hubbs and Bailey, 1940: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=398, Revision Date: 6/17/2019, Peer Review Date: 5/16/2014, Access Date: 6/16/2024

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.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/16/2024].

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