Abstract
Experiments were conducted to develop a sensitive sublethal toxicity test protocol to determine the toxicity of municipal wastewater effluents to larvae of the red abalone Haliotis rufescens. In multiple tests, fertilized abalone embryos were exposed for 48 h to dilutions of a reference toxicant, zinc sulfate, and to dilutions of primary-and secondary-treated effluents. The resulting veliger larvae were examined microscopically for larval shell abnormalities. In a longer flowthrough experiment, abalone were exposed for the entire larval phase, from the two-cell stage through metamorphosis, to compare zinc effects on metamorphosis with zinc effects on short-term larval shell development. Dissolved oxygen, pH, salinity and temperature were measured daily in test solutions, and zinc concentrations were verified by chemical analysis. “No observed effect concentrations” (NOECs) for zinc were 39±2.1 μg l-1 in three 48 h exposures, and 19 μg l-1 for the 9 d exposure through metamorphosis. Median effect concentrations (EC50s) were 68±6.9 μg l-1 in 48 h tests and 50 μg l-1 in the 9 d test. Abalone larvae were affected at lower concentrations of primary than of secondary effluent.
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Communicated by P. C. Schroeder, Pullman
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Hunt, J.W., Anderson, B.S. Sublethal effects of zinc and municipal effluents on larvae of the red abalone Haliotis rufescens . Mar. Biol. 101, 545–552 (1989). https://doi.org/10.1007/BF00541657
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DOI: https://doi.org/10.1007/BF00541657