Bioaccumulation of Kepone by Grass Shrimp ('Palaemonetes pugio'): Importance ofDietary Accumulation and Food Ration

摘要

The relative extent of dietary accumulation and bioconcentration of Kepone bygrass shrimp (Palaemonetes pugio) was quantitatively evaluated at food rations of 4 and 8% of the average wet weight of the shrimp. (14)C-Kepone was utilized to determine bioconcentration and dietary accumulation separately, while (14)C-Kepone-contaminated food (grass shrimp) and unlabeled Kepone in water were used to determine accumulation from both sources simultaneously. Grass shrimp and their food were exposed to the same aqueous Kepone concentration (0.04 micrograms/l). A first-order pharmacokinetic equation was used to model Kepone accumulation kinetics during the 16-day uptake and 21-day clearance phases. A doubling of contaminated food ration caused a significant increase in the whole-body Kepone concentration in the shrimp. Shrimp fed either a 4% or 8% ration of uncontaminated food and exposed to 0.04 micrograms/l Kepone in water bioconcentrated Kepone to the same level. When shrimp were exposed to contaminated water and food, Kepone contributions from each source were additive.