Abstract
The toxicity of the oil dispersing agent Corexit® 7664 was evaluated using the early life stages of four California marine species: the red abalone (Haliotis rufescens), the topsmelt (Atherinops affinis), a mysid (Holmesimysis costata), and the giant kelp (Macrocystis pyrifera). Spiked-exposure, continuous-flow toxicity tests of 48–96 h were performed in triplicate in closed test chambers. Dispersant concentrations were measured by UV spectrophotometry. In terms of median-effect concentration, the order of test sensitivity was Haliotis>Atherinops>Holmesimysis>Macrocystis. NOEC data also showed Haliotis tests to be the most sensitive, with Macrocystis tests having similar values, followed by Atherinops and Holmesimysis tests, respectively. Toxicity of Corexit® 7664 was compared to that of Corexit® 9527, and the latter was found to be more toxic to all four species; interspecific rankings were similar for the two agents.
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