"Perfluorooctane sulfonate concentrations in lake trout from Lake Ontario, 1979 to 2015",,, ,,, Year,Sample size (number of fish),Geometric mean concentration (nanograms/gram wet weight),Data source 1979,4,16.2,Furdui VI et al. 1983,5,38.5,Furdui VI et al. 1988,5,56,Furdui VI et al. 1993,5,62.4,Furdui VI et al. 1998,5,27.6,Furdui VI et al. 2001,5,43.8,Furdui VI et al. 2004,5,40.5,Furdui VI et al. 1997,7,63.5,"Environment and Climate Change Canada, Retrospective analysis" 1998,8,69.5,"Environment and Climate Change Canada, Retrospective analysis" 1999,6,76.4,"Environment and Climate Change Canada, Retrospective analysis" 2000,8,64.2,"Environment and Climate Change Canada, Retrospective analysis" 2001,3,43.7,"Environment and Climate Change Canada, Retrospective analysis" 2002,9,109,"Environment and Climate Change Canada, Retrospective analysis" 2003,7,44.7,"Environment and Climate Change Canada, Retrospective analysis" 2004,6,76,"Environment and Climate Change Canada, Retrospective analysis" 2005,6,42.7,"Environment and Climate Change Canada, Retrospective analysis" 2006,12,69.7,"Environment and Climate Change Canada, Retrospective analysis" 2007,5,86.5,"Environment and Climate Change Canada, Retrospective analysis" 2008,10,51.3,"Environment and Climate Change Canada, Retrospective analysis" 2009,10,87.4,"Environment and Climate Change Canada, AXYS Analytical study" 2010,10,52.8,"Environment and Climate Change Canada, AXYS Analytical study" 2011,10,52,"Environment and Climate Change Canada, AXYS Analytical study" 2012,10,31.1,"Environment and Climate Change Canada, National Laboratory for Environmental Testing" 2013,10,34.1,"Environment and Climate Change Canada, National Laboratory for Environmental Testing" 2014,20,57.1,"Environment and Climate Change Canada, National Laboratory for Environmental Testing" 2015,10,45.4 ,"Environment and Climate Change Canada, National Laboratory for Environmental Testing" ,,, Source: Environment and Climate Change Canada (2018) Chemicals Management Plan Environmental Monitoring and Surveillance (https://www.canada.ca/en/health-canada/services/chemical-substances/chemicals-management-plan/monitoring-surveillance.html).,,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,,