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Acute toxicity tests for mercury (Hg), lead (Pb), copper (Cu), nickel (Ni), and zinc (Zn) were conducted on juvenile Cyprinus carpio. The 96 hr LC50 values for Hg, Pb, and Cu were 0.16, 0.44, and 0.30, respectively for smaller (3.5 cm) fish and 0.77, 0.80, and 1.0, respectively for larger (6.0 cm) fish. Replicate LC50 values for Fe, Ni, and Zn were somewhat variable, but generally increased as fish size increased.
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