Invasive zebra mussels have been found within the Saint John River drainage in both Quebec and New Brunswick, with the nearest visually confirmed infestation in the Madawaska River on the dam in Edmundston, New Brunswick. Further eDNA analysis suggests the presence of zebra mussels in the mainstem of the Saint John River. Zebra mussel larvae are microscopic and free-floating, making them the most likely life stage of zebra mussels to be spread from one water body to the next. It is imperative all outdoor enthusiasts use extreme caution to limit the spread, particularly in waters with known infestations, like the Saint John River drainage.

Zebra mussels filter and hold a substantial amount of important food and nutrients that native organisms require, negatively impacting all native fish and wildlife in the water body. Unlike our native mussels, zebra mussels attach to hard surfaces in the water, including watercraft, pipes (which can clog intake/outflow), rocks, docks, and even native mussels.

Once an aquatic invasive species has established in a body of water, it is extremely difficult for it to be eradicated. These efforts are costly, often risky, and not always successful, and introductions have the potential to change our natural places and the way we enjoy them forever.

To keep our waterways pristine and healthy for future recreation, we need your help to keep these threats out of Maine waters.

How you can help limit the spread of zebra mussels:

Prevention is key. So much of the spread comes from people simply enjoying the great outdoors. It?s our duty as those who enjoy using Maine?s waters to become informed, attentive, and accountable for our potential role in the spread of invasive species and to take steps to protect Maine?s waters.

Always practice these clean, drain, dry recommendations and laws for watercraft.?

• Clean off visible aquatic plants, animals, and mud from watercraft, motor, trailer, and equipment before leaving water access.
• Drain water from watercraft, motor, bilge, bladder tanks, live well, and portable bait containers away from the water before leaving water access.
• Dry completely before reuse.

Allowing watercraft and all gear to dry thoroughly between water bodies is one of the most effective ways to prevent the spread of these microscopic zebra mussel larvae. This drying should occur for multiple days (2-5 days) when possible.