Zebra and Quagga Mussels are aggressive invaders that will colonize on any hard surface, such as this outboard motor propeller.

Aquatic invasive species (AIS) are plants,animals or microbes that create negative impacts on the environment. These impacts can be ecological or economic, but are most commonly both. Impacts from AIS are felt by everyone, not just by boaters and anglers. Often there is no way to remove invasive species after they are established in the wild, so it is important to prevent their introduction.

The Invasive Species Action Network (ISAN) is dedicated to reducing the human caused spread of invasive species that are invading our waters. The Invasive Species Action Network provides solutions to invasive species problems by focusing on scientific research, education programs and policy development. We engage people in a positive and cooperative effort to reduce spread of invasives.


How do humans move AIS and what we can do about it? What is the best way to clean boats, boots and other equipment? The AIS problem is large and growing. The Invasive Species Action Network works to find solutions and provides people with practical tools. Together, we can help stop the spread of invasive species.

didymo algae in New Zealand river

Didymosphenia geminata a.k.a. 'Rock Snot' or 'didymo' is an aggressive invasive alga impacting cold waters around the world, such as this river in New Zealand overtaken with didymo.


ISAN provides programs designed to increase awareness and provide appropriate actions to address the invasive species issue. Through collaborative partnerships, ISAN has implemented several model programs that can be replicated in other areas. ISAN personnel offer ANS training for schools, sportsman, and conservation groups. Learn about our innovative programs like the Riparian Weed Project or Clean Angling.


Many resource managers and agency officials are discovering that existing polices and statutes are not adequate to deal with the new situations created by AIS. The Invasive Species Action Network works on a host of national and state issues that affect invasive species policy. Learn about recent developments in felt soled boot restrictions as states try to regulate invasive species transport.

Invasive species continue to spread to new waters despite general awareness about them. This is likely because many people don't know what actions to take or how to help. Thank you for your interest in helping to stop the spread of invasive species. With your help and support, together we can make a real difference in keeping our waterways free of unwanted invaders so we can enjoy our fishing, boating, and on-the-water recreation for years to come. Learn more about invasive species and how you can get involved.

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ISAN is proud to be a Stop Aquatic Hitchhikers partner.