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About the 100th Meridian Initiative

The 100th Meridian Initiative is a cooperative effort between local, state, provincial, regional and federal agencies to prevent the westward spread of zebra/quagga mussels and other aquatic nuisance species in North America. More Information.

Did you find something unusual?
If you need to notify authorities regarding an aquatic invasive species, please visit for a list of authorities by state.

Video Please see the links below for the online version of high definition videos from the
Pacific State Marine Fisheries Commission

Part 1: Don’t Move A Mussel 2011
Part 2: Inspection & Decontamination 2011

Produced by Bill Zook (Video Catalog)

Where are the mussels?
Want to know which western waterbodies are considered to be either “positive” for quagga or zebra (Dreissenid) mussels or for a “critical” invasive plant species? Take a look at our List of Critical Waters.

Quagga Mussel

New Report on Early Detection
Reliability of Early Detection of Dreissena spp. Larvae by Cross Polarized Light Microscopy, Image Flow Cytometry, and Polymerase Chain Reaction Assays Results of a Community Double-Blind Round Robin Study (Round Robin Study Phase II). Marc E. Frischer, Sandra A. Nierzwicki-Bauer, and Kevin L. Kelly.

Download the full report at

Clean, Drain, and Dry Everything!

Life Cycle


Zebra Mussels

Zebra Mussel Druse

Zebra Mussels on Rock

Mussel on Monofilament

Development of this web site is supported by the U.S. Fish & Wildlife Service through a partnership with the University of Texas - Arlington and contains information and resources derived from a variety of other partners and sources. Materials on this web site are free for public use and are not intended to be used for profit. Read more...

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