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Potential Effects of Contaminants on Fraser River Sockeye Salmon

Potential Effects of Contaminants on Fraser River Sockeye Salmon

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Table 4.42. Frequency <str<strong>on</strong>g>of</str<strong>on</strong>g> exceedance <str<strong>on</strong>g>of</str<strong>on</strong>g> the selected toxicity screening values for surface water in the Nechako <strong>River</strong> Area <str<strong>on</strong>g>of</str<strong>on</strong>g> Interest.Chemical <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>Potential</str<strong>on</strong>g> C<strong>on</strong>cernFrequency <str<strong>on</strong>g>of</str<strong>on</strong>g> Exceedance <str<strong>on</strong>g>of</str<strong>on</strong>g> Toxicity Screening Values (total number <str<strong>on</strong>g>of</str<strong>on</strong>g> samples)Spawning & Incubati<strong>on</strong> Juvenile Rearing Smolt Outmigrati<strong>on</strong> Adult Upstream Migrati<strong>on</strong>Pre-1990 Post-1990 Pre-1990 Post-1990 Pre-1990 Post-1990 Pre-1990 Post-1990Metals (c<strong>on</strong>tinued)Mercury, total ND ND ND ND 100% (17) 100% (7) 100% (29) 100% (8)Molybdenum, total 0% (21) ND ND 0% (17) 0% (18) 0% (76) 0% (31) 0% (145)Nickel, total ND ND ND 0% (17) 0% (11) 0% (71) 6% (17) 0% (134)Selenium, total ND ND ND 0% (15) 0% (23) 0% (67) 0% (42) 1% (133)Silver, total ND ND ND 0% (9) ND 5% (57) ND 4% (114)OtherPhenols ND ND ND ND 0% (7) 25% (4) 9% (11) 0% (7)ND = no data; TSS = total suspended solids.Only chemicals <str<strong>on</strong>g>of</str<strong>on</strong>g> potential c<strong>on</strong>cern for which data were available in an area <str<strong>on</strong>g>of</str<strong>on</strong>g> interest were reported.Pre-1990 includes 1990.T-187

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