Toxic effects of domestic sewage on zooplankton
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The toxic effects of raw domestic sewage on different groups of zooplank-ton, was tested in the laboratory for evaluating acute toxicity. 24 hr., LC-50 values for larvae of stomatopods, gastropods and chaetognaths (2-7% concentration) indicated that they are very sensitive to the sewage. Copepods, Lucifer and decapod larvae (20-30% concentration.) were moderately tolerant. Acetes, medusae, ctenophores and mysids were the most resistant groups (42-49% concentration).
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