Common name: Flathead Chub
available through www.itis.gov
Identification: Woodling (1985); Hubbs et al. (1991); Page and Burr (1991); Etnier and Starnes (1993); commonly used name is Hybopsis gracilis.
Size: 32 cm.
Native Range: Mackenzie, Saskatchewan, and Lake Winnipeg drainages in Yukon, Northwest Territories, Manitoba, Saskatchewan, Alberta, and British Columbia; Missouri-Mississippi River basin from southern Alberta and Montana to Louisiana; upper Rio Grande (including Pecos) drainage, New Mexico. Restricted to Mississippi River proper in Missouri, Illinois, and south; localized in Arkansas River drainage in Oklahoma, Texas, and New Mexico (Page and Burr 1991).
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 Platygobio gracilis are found here.
Table last updated 1/24/2021
† Populations may not be currently present.
Means of Introduction: Introduced in the Gila River drainage of New Mexico via bait-bucket release (Koster 1957; Sublette et al. 1990). This species was privately stocked as prey for a trout hatchery in the Russell Lakes area of Colorado; the fish came from the Arkansas River drainage (Zuckerman and Behnke 1986). Probably bait-bucket release in Minnesota.
Status: Recorded as having been established, at least temporarily, in part of the Gila drainage of New Mexico (Koster 1957); in contrast, Sublette et al. (1990) reported that the species did not became established there. In Colorado, the species apparently persisted for 15 years in the San Luis Closed Basin, but it is no longer considered extant in that region (Zuckerman and Behnke 1986). Recorded as occurring in Minnesota.
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.
References: (click for full references)
Peterka, J. J. and T. M. Koel. 1996. Distribution and Dispersal of Fishes in the Red River Basin. Report submitted to Interbasin Biota Transfer Studies Program, Water Resources Research Research Institute, Fargo, ND. Northern Prairie Wildlife Research Center Home Page. http://www.npwrc.org/resource/distr/others/fishred/fishred.htm (version 29AUG97).
Revision Date: 12/2/2019
Peer Review Date: 3/18/2010
Nico, L., 2021, Platygobio gracilis (Richardson, 1836): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=625, Revision Date: 12/2/2019, Peer Review Date: 3/18/2010, Access Date: 1/25/2021
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.