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Aquatic nuisance species
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Unwanted invaders

Zebra mussels cover
a stick.
Photo: NOAA, Great Lakes Environmental Research Lab
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Some call them "aquatic nuisance species" and others call them "invasive species," but the bottom line is the same. These are species of animals and plants that we really don't want in our fishing waters. They damage fisheries. They can completely change our fish habitat. And once these invaders arrive, there's often nothing that can be done to get rid of them.
Western states have been battling the spread of whirling disease since 1995, hoping to slow the spread of the parasite which proves so deadly to rainbow and other trout species.
But possible invaders don't stop there. Live bait illegally brought into the state could include unwanted species like silver carp, bighead carp, grass carp, ruffe or round goby. Unwashed boats or trailers could bring seeds or sprouts of other unwanted vegetation.
On this page, you'll find some resources to help you learn what we're up against and what you can do to protect our waters no matter where you fish.

A zebra mussel
Photo: Ohio Sea Grant
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How to identify a zebra mussel:
* Zebra mussels look like small clams with a dark D-shaped shell and light-colored stripes (hence the name zebra).
* Most are under an inch long, but they can be up to two inches long.
* The adults usually grow in clusters attached to hard surfaces.
* The young mussels on the surface of boats look like black pepper and feel like sandpaper.
How to help:
Before leaving any water body:
* Remove all plants, sediment and tiny organisms that cling to your boat and trailer.
* Drain all water from your boat, including from the motor, live well and bilge. Do not transfer any water from one water body into another.
* Never release live bait into a water body or transport aquatic animals from one water body into another. Always discard of unwanted bait with household trash in the landfill. Likewise, dispose of fish carcasses with trash.
* Wash your boat, trailer and all fishing gear and equipment. High-pressure hot water is best.
* Air-dry your boat and equipment for as long as possible between fishing trips.
If you find a zebra mussel:
* Note the date and location where the mussel was found.
* Take the mussel with you and store it in rubbing alcohol.
* Notify the Wyoming Game and Fish Department immediately if you find these species.
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Boats, trailers can
attract a lot of weeds
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