New Zealand Mud SnailA small (<5mm) freshwater snail that has invaded many rivers and streams in Montana and Idaho, the New Zealand mudsnail is rapidly moving across the West, likely transported in damp fi shing gear, etc. For more information see www.montana.edu/nzms

Mitten CrabA large, primarily freshwater species, the mitten crab has invaded San Francisco Bay and may pose a threat to other West Coast estuaries. Mitten crab burrowing destabilizes river banks and increases erosion. For more information see www.delta.dfg.ca.gov/mittencrab/

HydrillaAn aggressive aquatic weed forming dense mats, hydrilla is considered the most problematic aquatic plant in the U.S. For more information see www.plants.ifas.ufl .edu/hydcirc

Snakehead FishSnakeheads have rapidly gained notoriety after having been discovered in several locations on the East Coast. These fi sh can be voracious predators and may pose a signifi cant threat to fi sh and wildlife if intorduced in the West. Import and possesion of these fi sh is now illegal but snakeheads continue to be found for sale at pet stores and live seafood markets. For more information see www.dgif.state.va.us/fi shing/snakeheads

OTHER AQUATIC THREATS TO THE WEST

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Be a volunteer and help prevent further damage! See clr.pdx.edu/projects/zebra_mussel for details

Five things you can do to Stop the Spread of invasive species:

1. Volunteer to be a zebra mussel monitor (see inside)2. Clean, drain and inspect your boat, motors, anchors and fi shing gear. Allow boat and gear to dry thoroughly when moving between water bodies. 3. Never dump bait. Dispose of it properly on land.4. Never release aquarium or pond species into the wild 5. Report sightings of introduced species to your local fi sh and wildlife offi ce or call 1 800 STOP ANS

For more information on zebra mussels and other invasive species please visit these web sites:

Minnesota Sea Grant - Outreachhttp://www.seagrant.umn.edu/exotics/

The Zebra Mussel Information Systemhttp://www.wes.army.mil/el/zebra/zmis

USGS - Non indigenous Aquatic Species Resourceshttp://nas.er.usgs.gov/

Virginia Sea Grant - Outreachhttp://www.vims.edu/bridge/exotic.html

Stop Aquatic Hitchhikershttp://protectyourwaters.net/

For more information on the zebra mussel substrate program please contact us at:

The Center for Lakes and ReservoirsPortland State University-ESRPortland, OR 97207-0751

www.clr.pdx.edu/projects/zebra_musselinvasivespecies@pdx.edu503 752 3834

design by Laura Rosenthal 2004 ler@lclark.edu

STOPTHE

SPREAD