Acute and Chronic Toxicity of Selenium to Estuarine Organisms

Acute toxicity tests were conducted with selenium and five estuarine organIsms, and chronic or early life stage tests were conducted with mysid shrimp (Mysidopsis bahia) and sheepshead minnows (Cyprlnodon varlegatus). The concentrations of selenium lethal to 50% of the test animals after 96 hours of exposure (96-hour LC50\u27s) ranged from 1.2 mg/l for brown shrimp (Penaeus aztecus) to 7.4 mg/l for sheepshead mlnnows. The maximum acceptable toxicant concentration (MATC) was \u3e 0.14 \u3c 0.32 mg/l for mysid shrimp and \u3e 0.47 \u3c 0.97 mg/l for sheepshead minnows. The application factor limits for mysid shrimp and sheepshead minnows were 0.09-0.21 and 0.06-0.13, respectively