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Official Massachusetts Boating Handbook

It's the Law: The Environment and Your Vessel

Invasive Species

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.

Hydrilla on prop

Why are they harmful?

  • Restrict boating and 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 invasive species take over.
  • Expensive: Once exotic plants are established, they are almost impossible to eradicate and expensive to control. The United States invests millions of dollars annually to manage these plants and repair the damage.

Invasive aquatic species

How can you prevent their spread?

  • Remove all plant parts from your boat motor, trailer, anchors, fishing gear and dive gear. Dispose of plant matter above the waterline on dry land or in a trash can.
  • Dispose of live well, bait and cooling water away from the shore after each use.
  • Never release a plant or animal into a body of water unless it came out of that body of water.
  • Wash your boat, preferably with hot water, and allow it to completely dry before entering another body of water.
  • Familiarize yourself with invasive species by requesting one of our free color guides to invasive aquatic plants and spread the word to others about invasive species.
  • Get involved. Request a free “Stop the Spread” sign for your boat ramp or join a weed monitoring group to identify and eradicate new infestations in your lake before they become permanently established.
  • Be alert for zebra mussels. They have not yet been reported in MA, but are established in NY, VT, and CT. Zebra mussels can destroy dive gear, boat motors and other engines. Please report any possible infestation.
Zebra mussels

Mussels on motor

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Online boating safety handbook last modified: April 22, 2008
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