Dioxins Contamination in Sediment and their Effect on Accumulation in the Portuguese Oyster (Crassostrea angulata) and White Shrimp (Litopenaeus Vannamei)

Abstract

This research aims to realize whether the dioxin accumulation in the oyster and white shrimp which were cultured in the dioxin pollutant sediment. This presented evidence indicated that dioxin was detected in all experimental groups with high concentration accumulated in experiment animals. Observation of the concentration, the PCDD/F, 2,3,7,8-T4CDD was with high concentration in the sediment and declined with the time elapsed. Detection of the dioxin accumulated in the animal, the accumulative maximum amounts was in the oyster as 3746.16 (pg-TEQ/g d.w.) and in the shrimp as 705.44 (pg-TEQ/g d.w.). The detected amount of dioxin in the supernatant was quite low, and less to release into the water. The filter habit animal of oyster and demersal habit of white shrimp were both detected the dioxin accumulated in the organs. As our findings, the dioxin in the sediment is transferred into the oyster and shrimp, the accumulated amount was increased by the bio-magnification with the elapsed time.