Aquatic Nuisance Species
What are they?
Invasive species are plants or animals, either indigenous
to this region (native) or from other regions (non-native
or exotic), that have the ability to dominate or alter an
ecosystem. Most exotic species originally arrived in ballast
water or were intentionally or accidentally released from
aquariums. Invasive species often are spread by remaining
on boat trailers, props, fishing gear or in bait bucket,
cooling and live well water.
Why are they harmful?
- Prevention of boating/fishing: Many invasive plants
grow rapidly in our lakes. The dense mats of vegetation
they form can restrict or entirely prevent boating
and fishing and may make the waterway entirely impassable.
- Loss of native plants and animals: Non-native plants
often do not provide ideal habitat or food for fish
and other aquatic animals. These plants crowd out
native vegetation, and the animals that depend on
native vegetation must relocate or perish.
- Loss of biodiversity: The spread of invasive species
often reduces the biological diversity of the area
and can disrupt the balance of the ecosystem.
- Loss of property value: The aesthetic appeal, recreational
value and surrounding property values of a lake may
quickly decline as the invasive species takes over.
- Expensive: Once exotic plants are established,
they are almost impossible to eradicate and expensive
to control. The United States has invested millions
of dollars annually to manage these plants and repair
the damage.
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How can you prevent their spread?
The South Dakota Department of Game, Fish and Parks is
teaming with the South Dakota B.A.S.S. Federation in an effort
to prevent the further spread of aquatic nuisance species
such as zebra mussels and Eurasian water-milfoil. The program
encourages boaters (including those with personal watercraft)
to wash their boats (including live wells and any place that
may hold water) and trailers before launching them into South
Dakota waters.
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| Eurasian Milfoil |
Purple Loosestrife |
Zebra Mussel |
Who should wash their boat and trailer?
Anyone who has had their boat/personal watercraft in waters
outside of South Dakota or anyone who has had their boat/personal
watercraft in South Dakota waters known to contain aquatic
nuisance species.

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