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Dames & Moore, 1999 - USDA Forest Service

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TABLE 7.2.3-1B<br />

RESULTS OF PEER-REVIEWED BIOASSAYS WITH SALMONID FISHES<br />

* The chronic value for copper is apparently higher than the acute value because toxicity is complete within 96 hours for this metal and because<br />

the chronic bioassays were run at slightly higher water hardnesses. While the available data for ILLS are of good quality, an alternative<br />

approach was used to estimate the chronic NOEC for copper. McKim et al. (1971) showed that the MATC for brook trout exposed to<br />

copper for 22 months ranged between 0.1 and 0.17 of the 96 h LC50. If the lower of these two factors is applied to the geometric mean<br />

LC50 calculated above, the chronic NOEC is 2.3 ug copper&. This agrees well with the hardness corrected chronic value in Table 3-1.<br />

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17693-005-019Uuly 27, <strong>1999</strong>:5:59 PM; D m FMAL RI REWRT

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