The Exposure Route of POPs in the Estuarine Ecosystems and the Effects of the Biogeochemical Factors – Effect of Habitat deviation on the PCBs Accumulation of Liza affinis
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
吳先琪
DOI
922211E002027
Abstract
This study investigated the Polychlorinated biphenyls (PCBs) contamination level of mullet fish (Liza
affinis) resided in the Er-Jen estuary, the Ann-Ping Harbour and nestled costal fish farms, and that of
surface sediments in this estuary were also examined to verify the seasonal fluctuation on the dietary
source of PCBs in the estuarine mullet fish. The PCB body burdens of collected fish samples are
proportional to the contamination level of their habitats and rank in sequence from the Er-Jen estuary,
the Ann-Ping harbour to the fish farms. PCB content of the estuarine mullet has been approximately
depleted to one half of that of 1990’s peak value. Although the farmed fish inhabiting near the two hot
spots and whose PCB burden is higher than that of the average of local fish markets, no particularly
high contamination level was observed in their bodies. Applying light PCB fraction ((triCB + tetraCB) /
total PCBs) as the indicator of the origins of PCB, mullet fish near the former contamination hot spot
performed higher body burden with lower light PCB fraction, while the farmed fish exhibited the PCB
pattern more likely that originated from air-water exchange. Preliminary study on the transformation of
PCB burden from mother mullet to their next generation through reproduction indicated that
congener-specific characteristics dominate this transformation. Higher fraction of heavy-chlorinated
PCBs, rather than light-chlorinated congeners, observed in the eggs indicated that resistance to PCB
biotransformation of heavy congeners led to this result. Although the PCB contamination has been
stopped for a decade, the residual contaminants, supposedly existing in soil and sediments, still
contributes to the body burden of fish resided in the estuary and the harbour.
Subjects
PCBs
estuary
harbour
fish farm
eggs
mullet
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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