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Avoidance of Pentachlorophenol by Postlarval Brown Shrimp in a Laminar-Flow Choice Chamber


, : Avoidance of Pentachlorophenol by Postlarval Brown Shrimp in a Laminar-Flow Choice Chamber. Canadian Journal of Fisheries & Aquatic Sciences 51(4): 784-791

Responses of postlarval brown shrimp (Penaeus aztecus) to pentachlorophenol (0-450 mu-g cntdot L-1) were measured in synthetic seawater and estuarine water using a laminar-flow choice chamber. This chamber provides individual postlarvae with equal exposure to two parallel olfactant streams separated by a steep concentration gradient. Shrimp detected and avoided pentachlorophenol concentrations above 91 mu-g cntdot L-1 in synthetic seawater. This detection threshold reflects limitations in statistical power, and with increased replication the physiological threshold could probably be resolved it a much lower concentration. Pentachlorophenol appeared to be more repellent when dissolved in estuarine water from Galveston Bay, Texas. The 96-h LC-50 for pentachlorophenol was 317 mu-g cntdot L-1 which suggests that postlarvae are capable of avoiding acutely toxic concentrations of this pollutant. For postlarvae of this species, behavioral avoidance appears to provide a more sensitive indicator of pollutant response, than the conventional toxicity bioassay.

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