Disclaimer:

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.




Myocastor coypus
Myocastor coypus
(nutria)
Mammals
Exotic
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Myocastor coypus (Molina, 1782)

Common name: nutria

Taxonomy: available through www.itis.govITIS logo

Identification: Large rodent, resembling both native beavers and muskrats. The nutria has a long, thin round tail wich distinguishes it from the beaver which has a flat tail and the muskrat which has a laterally flattened tail.

Native Range: southern South America

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Alaska
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Hawaii
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Puerto Rico &
Virgin Islands
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Guam Saipan
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 Myocastor coypus are found here.

StateYear of earliest observationYear of last observationTotal HUCs with observations†HUCs with observations†
Alabama194919563Mobile Bay; Mobile-Tensaw; Perdido Bay
Arkansas1958200532Bayou Bartholomew; Bayou Macon; Bayou Meto; Big; Bodcau Bayou; Cache; Cadron; Dardanelle Reservoir; Fourche La Fave; Frog-Mulberry; Lake Conway-Point Remove; L'anguille; Little Missouri; Little Red; Little River Ditches; Loggy Bayou; Lower Arkansas; Lower Arkansas-Maumelle; Lower Black; Lower Little Arkansas; Lower Mississippi-St. Francis; Lower Ouachita-Bayou De Loutre; Lower Ouachita-Smackover; Lower Saline; Lower St. Francis; Lower White; Lower White-Bayou Des Arc; Mckinney-Posten Bayous; Middle White; Petit Jean; Upper Ouachita; Upper Saline
California189920188Lower San Joaquin River; Middle San Joaquin-Lower Chowchilla; Middle San Joaquin-Lower Merced-Lower Stanislaus; San Joaquin; Santa Clara; Upper Merced; Upper Stanislaus; Upper Tuolumne
Delaware199320053Brandywine-Christina; Broadkill-Smyrna; Nanticoke
Florida1956200920Apalachicola; Aucilla; Blackwater; Choctawhatchee Bay; Crystal-Pithlachascotee; Daytona-St. Augustine; Hillsborough; Lower St. Johns; Lower Suwannee; Oklawaha; Peace; Pensacola Bay; Perdido; Tampa Bay; Upper St. Johns; Upper Suwannee; Vero Beach; Waccasassa; Withlacoochee; Yellow
Idaho195819612Middle Snake-Payette; St. Joe
Iowa195719571Keg-Weeping Water
Kansas194519451Gar-Peace
Louisiana1940200630Amite; Atchafalaya; Atchafalaya - Vermilion; Bayou Cocodrie; Bayou Sara-Thompson; Bayou Teche; Black Lake Bayou; Boeuf; Calcasieu-Mermentau; East Central Louisiana Coastal; Eastern Louisiana Coastal; Lake Maurepas; Lake Pontchartrain; Liberty Bayou-Tchefuncta; Lower Calcasieu; Lower Grand; Lower Mississippi-New Orleans; Lower Red-Lake Iatt; Lower Sabine; Mermentau; Mermentau Headwaters; Tangipahoa; Tensas; Tickfaw; Toledo Bend Reservoir; Upper Calcasieu; Vermilion; West Central Louisiana Coastal; West Fork Calcasieu; Whisky Chitto
Maryland1943200813Chester-Sassafras; Choptank; Conococheague-Opequon; Lower Potomac; Middle Potomac-Anacostia-Occoquan; Middle Potomac-Catoctin; Nanticoke; North Branch Potomac; Patuxent; Severn; Tangier; Upper Chesapeake Bay; Youghiogheny
Massachusetts200220021Charles
Minnesota194719492Cannon; Lower Rainy
Mississippi1956200513Bayou Pierre; Big Sunflower; Black; Buffalo; Coldwater; Coles Creek; Deer-Steele; Horn Lake-Nonconnah; Lower Mississippi-Helena; Lower Mississippi-Natchez; Mississippi Coastal; Pascagoula; Upper Yazoo
Missouri195820053Little River Ditches; Lower St. Francis; New Madrid-St. Johns
Montana194419441Upper Willamette
Nebraska194419582Big Papillion-Mosquito; Upper Republican
Nevada194419542Carson Desert; Truckee
New Jersey200720071Cohansey-Maurice
New Mexico193719963San Simon; Upper Pecos; Upper Pecos-Long Arroyo
New York198919891Upper Hudson
North Carolina195820175Albemarle; Lower Roanoke; Pamlico; Pamlico Sound; Upper New
Ohio1936196110Auglaize; Black-Rocky; Grand; Little Miami; Lower Maumee; Lower Scioto; Mahoning; Raccoon-Symmes; Tuscarawas; Upper Great Miami
Oklahoma198919894Cache; Middle Washita; Upper Little; Upper Washita
Oregon1936201338Alsea; Clackamas; Coast Fork Willamette; Coos; Coquille; Lower Columbia; Lower Columbia-Clatskanie; Lower Columbia-Sandy; Lower Grande Ronde; Lower Owyhee; Lower Rogue; Lower Snake-Asotin; Lower Willamette; Mckenzie; Middle Columbia-Hood; Middle Columbia-Lake Wallula; Middle Fork Willamette; Middle Rogue; Middle Willamette; Molalla-Pudding; Necanicum; Nehalem; North Santiam; North Umpqua; Pacific Northwest Region; Powder; Siletz-Yaquina; Siltcoos; Siuslaw; South Santiam; South Umpqua; Tualatin; Umpqua; Upper Deschutes; Upper Grande Ronde; Upper Willamette; Wilson-Trusk-Nestuccu; Yamhill
Tennessee199620053Lower Hatchie; Lower Mississippi-Memphis; Obion
Texas1945201693Amistad Reservoir; Aransas; Aransas Bay; Austin-Oyster; Austin-Travis Lakes; Baffin Bay; Big Bend; Bois D'arc-Island; Bosque; Brady; Buffalo-San Jacinto; Caddo Lake; Cedar; Central Laguna Madre; Chambers; Concho; East Fork San Jacinto; East Fork Trinity; East Galveston Bay; East Matagorda Bay; Elm Fork Trinity; Elm-Sycamore; Guadalupe; Hondo; Lake Fork; Lake O' the Pines; Lavaca; Leon; Little; Little Cypress; Lower Angelina; Lower Brazos; Lower Brazos-Little Brazos; Lower Colorado; Lower Colorado-Cummins; Lower Devils; Lower Guadalupe; Lower Neches; Lower Pecos; Lower Rio Grande; Lower Sabine; Lower San Antonio; Lower Sulphur; Lower Trinity; Lower Trinity-Kickapoo; Lower Trinity-Tehuacana; Lower West Fork Trinity; Lozier Canyon; Medina; Middle Brazos-Lake Whitney; Middle Brazos-Palo Pinto; Middle Colorado; Middle Colorado-Elm; Middle Guadalupe; Middle Neches; Middle Sabine; Navasota; Navidad; North Bosque; Pecan Bayou; Pine Island Bayou; Red-Lake Texoma; Sabine Lake; San Ambrosia-Santa Isabel; San Bernard; San Gabriel; San Marcos; San Saba; South Laguna Madre; South Llano; Spring; Sulphur headwaters; Toledo Bend Reservoir; Turkey; Upper Angelina; Upper Clear Fork Brazos; Upper Colorado; Upper Devils; Upper Frio; Upper Guadalupe; Upper Neches; Upper Nueces; Upper Sabine; Upper San Antonio; Upper Trinity; Village; West Fork San Jacinto; West Galveston Bay; West Matagorda Bay; West Nueces; West San Antonio Bay; White Oak Bayou; Yegua
Virginia195820083Albemarle; Hampton Roads; Pokomoke-Western Lower Delmarva
Washington1935201818Chief Joseph; Deschutes; Duwamish; Grays Harbor; Lake Washington; Lewis; Lower Columbia; Lower Columbia-Clatskanie; Lower Columbia-Sandy; Lower Cowlitz; Lower Skagit; Lower Yakima; Nisqually; Nooksack; Puget Sound; Snohomish; Strait of Georgia; Upper Chehalis
West Virginia201220121Upper Guyandotte

Table last updated 7/26/2018

† Populations may not be currently present.


Means of Introduction: Imported into Louisiana for fur farming.

Status: Feral populations are established in several states such as Louisiana, Maryland, Oregon, Texas, and Washington.

Impact of Introduction: Over-grazing of wetland habitats.

Author: Fuller, P.

Revision Date: 5/19/2005

Citation Information:
Fuller, P., 2018, Myocastor coypus (Molina, 1782): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=1089, Revision Date: 5/19/2005, Access Date: 9/18/2018

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.

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Page Last Modified: Monday, August 27, 2018

Disclaimer:

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. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [9/18/2018].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. For queries involving fish, please contact Pam Fuller. For queries involving invertebrates, contact Amy Benson.