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| NAS - Nonindigenous Aquatic Species |
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Common Name: giant floater
Taxonomy: available through 
Size: can reach 110 mm
Native Range:
The entire Mississippi River drainage including the Missouri; St. Lawrence River drainage and Lake Champlain.
Nonindigenous Occurrences: Hudson River.
Means of Introduction: May have been intentionally introduced.
Status:
Impact of Introduction: Unknown.
Remarks: Most abundant in lakes and ponds with mud bottoms and little current. Spawns in August and releases glochidia in May; host fish include longnose gar and blacknose dace.
References
Author: Amy Benson
Revision Date: 4/21/2004 Citation for this information:
Amy Benson. 2009. Pyganodon grandis. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=2240> Revision Date: 4/21/2004
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