in chapter 1 of this study the relationship between spatial, chemical, and biological factors and their influence on mercury concentration s in walleye were examined. water, sediment, and fish tissue samples were collected in the summer of the 2008 from 5 lakes near aroland first nation, in nortwesthern, ontario, canada and analyzed for metals, mercury, ph, and alkalinity. arc gis was used to extract spatial data from base map s and digital elevation models, in order to calculate lake area, watershed area, and wetland area for each study lake. hg concentrations in fish tissue were compared between lakes using a standardized length using an ancov a. the test proved that a significant difference was present (p=o.oooo with 95% confidence intervals). walleye (sander vitreum) from melchett lake had the highest levels of mercury with a mean concentration of 0,5505ug/g, while e snagami had the lowest at 0.2228 ug/g.