The goal of the project is to remove the introduced fish species roach (Rutilus rutilus) from 7 lakes in Bymarka, Trondheim, to prevent further spread of roach to the citys water supply, lake Jonsvatnet. The eradication of roach is done using the rotenone solution CFT Legumine, and is scheduled for the period from 19 to 23 of September 2016.