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An invasive species of algae, commonly called “didymo” or “rock snot,” has been found in the Upper Connecticut River and in Vermont 's White River. New England TU Members need to pull together to help stop the spread of didymo before it devastates wild trout populations.
Why We Care
Didymo does not present a health hazard to humans. However its impact on native and wild trout populations has been severe in New Zealand, Quebec and other areas. The algae, which thrive in cool water temperatures, attach themselves to the gravel and rocks at the bottom of the river bed. When the algae bloom, they form massive mats that coat the gravel and rocks. Reports of 4-inch to 5-inch thick mats are common. These mats form a barrier for native organisms (caddis, mayflies and stoneflies) that result in their decline. Studies suggest that young, wild trout populations are severely affected.
In addition, didymo is easy to spread. Each cell is very small, so they absorb easily into clothing, wading boots and sandals as well as stick to hard surfaces, such as tubes, kayaks and fishing gear. If owners don't clean and dry these items completely, the algae will live and spread the next time the owner uses the item. One report showed didymo surviving for 8 months on felt sole boots stored in a garage.
What You Can Do
After each fishing trip, soak all clothing, wading boots, sandals and so on in hot, soapy water for 30 minutes and wash all hard surfaces, such as tubes, kayaks and fishing gear with hot, soapy water as well. A 5% detergent solution is effective. Use 3/4 cups of any detergent (dish soap, antiseptic hand soap or laundry detergent) per gallon of hot tap water to kill the algae.
Learn more about didymo algae at www.biosecurity.govt.nz. For additional information about efforts in Vermont to address the problem, contact Mary Russ, Executive Director, White River Partnership at 1-802-767-4600 or www.whiteriverpartnership.org.