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In the 12.5% dilution to 0.58 mg in the 50% concentration. Average weight in the <br /> controls was 0.54 mg. No statistically significant differences were noted between the <br /> control fish weights and those of the exposed animals. <br /> DISCUSSION <br /> A chronic effect was found in the ceriodaph test. The ceriodaph effect was <br /> expressed as excessive mortality in the 100% effluent. No effect on survival or growth <br /> was seen in the fathead minnow test <br /> REFERENCES <br /> APHA/AWWA/WPCF. 1985. Standard methods for the examination of water and <br /> wastewater. 16th Edition. American Public Health Association. 1268 pp. <br /> Hach Chemical Company. 1978. DR-EL/2,3 and 4 methods manual. Hach Chemical <br /> Company, Loveland, Colorado. <br /> Weber, C.I. et al. 1989. Short-term methods for estimating the chronic toxicity of <br /> effluents and receiving waters to freshwater organisms. Second Edition. EPA1600/4- <br /> 89/001. 249 pp. <br />