Abstract
Acute and whole life-cycle toxicity tests were conducted with the estuarine mysid shrimp, Mysidopsis bahia, exposed to cyanide and selected heavy metals. Acute toxicity values (96 h LC 50) ranged from 3.5 μg/l for mercury to 3130 μg/l for lead, and were ranked in order of toxicity: Hg>Cd>Cu>Cn>Ag>Zn>Ni>As>Cr>Pb. The chronic toxicity values ranged from 1.2 μg/l for mercury to 893 μg/l for arsenic. Chronic values were calculated from either survival, time to first reproduction, or number of young produced. When acute toxicity data for the same chemical are compared, M. bahia is consistently among the more sensitive marine species. Lack of comparable data precludes a similar observation with chronic tests. Examination of the relative sensitivity of the chronic responses indicates that only for cadmium was survival more sensitive than reproduction. Reproduction and survival were equally sensitive for mercury, zinc, nickel and arsenic, while reproduction was the most sensitive chronic response for the remaining four metals. The acute-chronic ratios calculated for M. bahia in this study ranged from 1.6 for cyanide to 125 for lead. Sixty percent of the acute chronic ratios were ≤5.5 and 90% ≤15.4.
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