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 cataractae
Micropterus cataractae
(Shoal Bass)
Native Transplant

Copyright Info
Micropterus cataractae Williams and Burgess, 1999

Common name: Shoal Bass

Taxonomy: available through www.itis.govITIS logo

Identification: Williams and Burgess (1999); Page and Burr (1991); Mettee et al. (1996).

Size: 39 cm.

Native Range: Apalachicola River drainage of Alabama, Florida, and Georgia (Williams and Burgess 1999).

Native range data for this species provided in part by NatureServe NS logo
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 cataractae are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
AL194919802Middle Chattahoochee-Lake Harding; Middle Chattahoochee-Walter F
FL193319892Apalachicola; Chipola
GA1952201413Altamaha; Altamaha; Ichawaynochaway; Kinchafoonee-Muckalee; Lower Flint; Lower Ocmulgee; Middle Chattahoochee-Lake Harding; Middle Chattahoochee-Walter F; Middle Flint; Upper Chattahoochee; Upper Flint; Upper Ocmulgee; Upper Oconee

Table last updated 6/18/2024

† Populations may not be currently present.

Means of Introduction: Intentional authorized stocking for sportfishing.

Status: Established from about 35 miles above to 25 miles below the Fall Line.

Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.

Remarks: There are concerns regarding hybridization with native redeye bass M. coosae (Bart et al. 1994).

References: (click for full references)

Williams, J.D. and G.H. Burgess. 1999. A new species of bass, Micropterus cataractae (Teleostei: Centrarchidae), from the Apalachicola River basin in Alabama, Florida and Georgia. Bulletin of the Florida Museum of Natural History 42(2):80-114.

Other Resources:
FishBase Summary

Author: Fuller, P.

Revision Date: 12/16/2010

Peer Review Date: 12/16/2010

Citation Information:
Fuller, P., 2024, Micropterus cataractae Williams and Burgess, 1999: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=394, Revision Date: 12/16/2010, Peer Review Date: 12/16/2010, Access Date: 6/18/2024

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 [6/18/2024].

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