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| NAS - Nonindigenous Aquatic Species |
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Common Name: pearl dace
Taxonomy: available through 
Identification: Scott and Crossman (1973), Becker (1983), Smith (1985), Page and Burr (1991); another name is Semotilus margarita. Two subspecies are currently recognized, M. m. margarita in the Allegheny region, and M. m. nachtriebi in the rest of the range (Page and Burr 1991).
Size: 16 cm.
Native Range: Atlantic, Hudson Bay, Great Lakes, and Mississippi River basins in southern Canada and northern United States from Atlantic Coast to southern Northern Territories, eastern British Columbia, and Montana; south to Virginia, Michigan, Wisconsin, and Iowa. Isolated population in upper Missouri River basin, South Dakota, Nebraska, and Wyoming (Page and Burr 1991).
Nonindigenous Occurrences: This species was reported from the Byram River system in the Lower Hudson drainage, southwestern Connecticut (Whitworth et al. 1968; Whitworth 1996).
Means of Introduction: Unknown. Possible bait bucket release.
Status: Reported from Connecticut. The Byram River drainage was sampled in 1987 and 1988 but no additional specimens were found. Consequently, Whitworth (1996) concluded that the species was no longer present.
Impact of Introduction: Unknown.
Remarks: In some areas this species is considered important as a bait minnow (Scott and Crossman 1973).
Other Resources:
FishBase Fact Sheet
Author: Pam Fuller and Leo Nico
Revision Date: 3/22/2000 Citation for this information:
Pam Fuller and Leo Nico. 2009. Margariscus margarita. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=569> Revision Date: 3/22/2000
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