Avoidance of pentachlorophenol by postlarval brown shrimp (Penaeus aztecus) (Decapoda, Penaeidae) in a laminar-flow choice chamber

Responses of postlarval brown shrimp to pentachlorophenol 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. Galveston Bay is a highly industrialized estuary which recieves over half of Texas' permitted wastewater discharges. Acutely toxic pollutant effects are usually confined to the immediate vicinity of discharge points and seldom persist over widespread areas. For this reason, it is important to evaluate sublethal impacts.