"PentaBDE concentrations in Lake Trout from Lake Ontario, Canada, 1997 to 2018",, ,, Year,Number of samples,Average concentration (nanograms per gram wet weight) 1997,4,38 1998,4,30 1999,8,32 2000,7,39 2001,4,23 2002,4,31 2003,8,28 2004,8,23 2005,12,26 2006,14,24 2007,11,26 2008,24,28 2009,24,21 2010,10,28 2011,10,16 2012,10,17 2013,10,15 2014,15,19 2015,10,19 2017,37,11 2018,10,12 ,, "Note: In the table, pentaBDE concentrations are expressed as an annual geometric average. In 2013, Environment and Climate Change Canada published Federal Environmental Quality Guidelines for PBDEs to assess the ecological significance of levels of PBDEs in the environment. The Federal Environmental Quality Guideline for pentaBDE in fish tissues is 1 nanogram per gram of wet weight.",, Source: Environment and Climate Change Canada (2019) National Fish Contaminants Monitoring and Surveillance Program.,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,