Didymo is an alga, also known as "Rock Snot". It has been found in the Yukon and Kathleen rivers, but it may be elsewhere in Yukon. Didymo can degrade fisheries and the aquatic ecosystem.
Literature Review, Risk Assessment and Recommendations - 2016
The distribution of introduced Rainbow Trout in the Upper Yukon River Basin 2013.
How you can help stop the spread of aquatic invasive species. A brochure published by the Department of Fisheries and Ocean Canada.
Best Practices info sheet
The zebra mussel (Dreissena polymorpha) is a small freshwater mussel. This species was originally native to the lakes of southern Russia.The zebra mussel has been accidentally introduced to numerous other areas, and has become an invasive species in many different countries worldwide.