Specimen Information

Corbicula fluminea
Corbicula fluminea
(Asian clam)

Specimen ID1634244
Common NameAsian clam
LocalitySouth Umpqua River near Myrtle Creek, OR
Mapping AccuracyAccurate
HUC8 NameSouth Umpqua
HUC8 Number17100302
HUC10 NameClark Branch-South Umpqua River
HUC10 Number1710030211
HUC12 NameWillis Creek-South Umpqua River
HUC12 Number171003021102
Collection Day13
Collection Month9
Collection Year2018
Year AccuracyActual
Potential Pathwaydispersed current | hitch hiker gut passage
CommentsSite located approximately 300 meters downstream from the HWY 99 bridge over the South Umpqua River near Myrtle Creek, OR. I was systematically excavating 0.25 m squared quadrats to look for buried juvenile mussels. There were so many C. fluminea in my excavation units that I counted live animals in 6 excavation units that were equally spaced through the bed. I counted 1,098 live C. fluminea in the 6 excavation units I chose to count them in (I excavated substrate to 13 cm depth). This area represents just 1.25 percent of the total bed area (bed area sampled was 150 m squared), so there are 1000s more C. fluminea at this location that are not represented in my Number Observed reported above.
Record TypeNAS sighting report
VerifierWesley Daniel (USGS)
Number Collected1098


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. [2023]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [9/25/2023].

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 general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.