Abstract
The acute toxic effects of diflubenzuron (DFB) on various life stages of the grass shrimp, Palaemonetes pugio, were determined using a static renewal system. It was observed that the larvae and the postlarvae were the most sensitive to acute DFB toxicity; 96-hr LC50's being 1.44 and 1.62 μg L−1 respectively. Also variations among the 96-hr LC50's for these two life stages were the lowest (11.59% for larvae and 30.06% for postlarvae) compared to 68.9% for males and non-Ovgerous females. Ovigerous female grass shrimp (hence the embryos) appeared to be the most resistant to acute toxic effects of DFB with a mean LC50 of 6985 μg L−1. The limitations of LC50 data and the importance of molt-related sensitivity of the different life stages of P. pugio to diflubenzuron are discussed.
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