Invertebrates are excellent bio-indicators of the river water-quality and food sources for Atlantic salmon and Brook Trout. Invertebrates sampling in conjunction with water quality analysis helps to determine the effects of human activities on the in stream aquatic life at a site-specific. The species identifications helps us demonstrate that certain groups of stream macro-invertebrates have different tolerances to pollution witch they are use to indicates if the site and how long as it been impacted by a source of pollution.