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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.

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Common name: Bigeye Chub

Taxonomy: available through www.itis.gov

Identification: Robison and Buchanan (1988); Page and Burr (1991); Jenkins and Burkhead (1994). Mayden (1989) and Mayden et al. (1992) use Hybopsis, other authorities (e.g., Coburn and Cavender 1992; Gilbert 1998) have argued that this and related species should be in the genus Notropis (i.e., Notropis amblops). It is presently uncertain which of the two generic names will ultimately be accepted as valid.

Size: 9 cm.

Native Range: Lake Erie drainage, New York, Pennsylvania, Ohio, and Michigan; Ohio River basin from New York to eastern Illinois, and south to Tennessee River drainage, Georgia and Alabama; Ozarks of southern Missouri, northern Arkansas, and northeastern Oklahoma (absent in Missouri River drainage) (Page and Burr 1991).

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

Native range data for this species provided in part by NatureServe

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

Means of Introduction: Fish was probably introduced as a result of a bait bucket release.

Status: Reported in Connecticut; more recent sampling in state has failed to produce any additional specimens (Whitworth 1996).

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: Swift et al. (1977) reported two collections, of what was tentatively referred to as Hybopsis amblops, from the Ochlockonee drainage in Florida in 1967 (voucher specimens, UF 65225). These fish are now considered to represent a new species, one closely allied to Hybopsis winchelli (=Notropis winchelli), whose native range is thought to extend from the Perdido River in Alabama and Florida to the Apalachicola basin of Alabama, Florida, and Georgia (Clemmer 1970; Gilbert 1998). The Ochlockonee specimens of this undescribed species are most likely the result of introduction. Support for this conclusion, as stated by Swift et al. (1977), is based on the "recent vintage of these collections and the fact that extensive previous collecting by many investigators did not disclose the species..."

Other Resources:

Author: Nico, L.

Peer Review Date: 3/19/2013

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.