This report reviews approaches to reduce mercury contamination in aquatic systems, and identifies options with the potential to be applied in the Wabigoon-English River system. Approximately 10 tonnes of mercury were released to the Wabigoon River between 1962 and 1969 from a chlor-alkali facility at Dryden, Ontario, resulting in highly contaminated waters, sediments and biota. Mercury contamination in fish was observed at least as far as Tetu Lake, 250 km downstream of Dryden. After measures were carried out in the early 1970s to reduce mercury releases from the chlor-alkali facility,mercury concentrations quickly began to decline in sediments and fish, but unfortunately these concentrations stabilized or declined very slowly since the 1990s, and remained 2-10 times above regional background levels in Clay Lake walleye in 2010. [click to read the full report]