Abstract
Effects of 7 concentrations of mercury from 0.0 (control) to 0.056 ppm on survival and development of the larval grass shrimp Palaemonetes vulgaris (Say) were investigated. A concentration of 0.056 ppm Hg was toxic to all larvae within 24 h, but below a threshold level (≤0.0056 ppm) no lethal effect occurred within 48 h. Feeding appeared to increase slightly the resistance of P. vulgaris larvae to mercury, and 48-h TLm's (median tolerance limits) for fed and unfed larvae were 0.0156 and 0.0100 ppm, respectively. Delayed effects of 48-h exposure to sublethal mercury concentrations which appeared in later post-exposure rearing of the larvae included (1) reduced survival to the postlarval stage, (2) delayed molting, (3) extended development time, (4) increased numbers of larval instars, and (5) morphological deforment
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