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Results

Mean survival for each concentration of test solution

Figure 1: Mean (± 95% CI) percent survival of herring larvae exposed to different concentrations of retene, fir bark, hemlock chips, cedar chips and fir chips at the end of 7-day survival and growth tests (n= 4 for each test). Retene did not significantly affect herring mortality. Fir chips were the most toxic producing complete mortality in the 50% and 100% concentrations. Asterisks represent significant differences from the controls (p < 0.05).

Mean dry biomass for each concentration of test solution

Figure 2: Mean (± 95% CI) dry biomass (g) of remaining live larvae at the end of the 7-day survival and growth test for each treatment under the various test concentrations (n=4 for each test). There were no significant differences in mean dry biomass for retene. Among wood leachates, fir chips showed the lowest observed effective concentration of 25%. Asterisks represent significant differences compared to the controls (p < 0.05).

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• Western Washington University
• Bellingham, Washington