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Lewis County, Missouri

Information provided for informational purposes only

Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.

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Pesticide Table for the Fat Pocketbook Pearly Mussel | About the Fat Pocketbook Pearly Mussel
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Pesticide Table for the Fat Pocketbook Pearly Mussel

Active Ingredient Product or Trade Name
Propiconazole Tilt, Orbit, Banner

Trade names provided by the University of Missouri Extension Service. For additional information, contact your local University Extension office.

Do not apply within 20 yards from the water's edge (ground application) nor 100 yards from the water's edge (aerial application) within the shaded area(s) shown on the map.

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Fat pocketbook pearly mussel [Potamilus capax]

The Fat pocketbook pearly mussel is of the North American family Unionidae. A far larger percentage of this family are imperiled than any other species group. This mussel is about 4 inches long and has a smooth, shiny yellow to brown outer shell that is iridescent bluish white on the inside. It is found in sand, mud, or gravel in streams and rivers less than 8 feet deep, and feeds by siphoning phytoplankton and other plant matter from the water.

Historically, the Fat pocketbook was found in portions of the Wabash, Mississippi, Ohio, and Illinois River. It now is believed to be found in a small, undredged portion of the St. Francis River in St. Francis County, Arkansas. Few specimens were found in the mid-1970's in the Wabash River in Posey County, Indiana and a small tributary in Pike County, Indiana but is uncertain whether the fat pocketbook populations in these areas are still viable and reproducing.

Major factors affecting these mussel populations are alterations in temperature, waterflow, and siltation caused by stream damming, channeling, and dredging. Agricultural runoff and industrial practices have also affected the mussel habitat by degrading water quality. Because mussels are filter feeders, the effects of pollution are intensified due to the large quantities of water drawn through their siphons in the feeding process.

Efforts to restore Fat pocketbook populations include transplatation attempts by the Army Corps of Engineers, habitat reconstruction sites by the Fish and Wildlife Service, and concerted efforts by individuals and industries to ensure water quality.

Matthews, J.R. (ed.). 1990. The Official World Wildlife Fund Guide to Endangered Species, Beacham Publishing Inc, Washington, DC. Vol II, pp. 1009-1010.

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