These might include Elodea nuttallii and Najas marina, better known as western waterweed and spiny naiad, both of which have been spreading rapidly in German water bodies in recent years.

So far, Elodea has been discovered in areas of Sand Lake, Little Campbell Lake, and Delong Lake in Anchorage, and Chena Slough in Fairbanks. It can also be found in a number of lakes and slow ...