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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.

View of nuisance species on surface of waterbody

Asian carp

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.

Eurasian Milfoil Purple Loosestrife Zebra Mussel
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.

Hydrilla on outboard motor

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