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[Ｄ−２.２.２　Studies on the movement of hazardous chemicals in the foodweb of benthic fauna]


[Contact person]

      Jiro Koyama
      National Research Institute of Fisheries and Environment of Inland Sea
      2-17-5, Maruishi, Ohno-cho, Hirosima, 739-0452, Japan
      Tel +829-55-0666, Fax +829-54-1216


[Total Budget for FY1998-1999]

　19,332,000 Yen
　(FY 1999; 9,661,000 Yen)

［Abstract］

　From our recent study, TPT and Co-PCBs in the coastal sediment seemed to be accumulated by benthic fish through foodweb. In the present study, bioaccumulation of chemicals in the offshore sediment through offshore benthic foodweb in Japan Sea was studied. While the concentrations of PCDDs, PCDFs and Co-PCBs in the offshore sediments of Yamato Bank were much lower than those of Hokuriku and San-In, area, their concentrations in the benthic fauna were similar. TBT and TPT concentrations in the offshore sediments of Yamato Bank were similar with those of Hokuriku and San-In area. The concentrations of Co-PCBs and TPT in the benthic fish were higher among those of benthic fauna. These chemicals in the offshore sediment seemed to be accumulated through benthic foodweb.


［Key Words］

　sediment, foodweb, bioaccumulation, dioxins, organotin compounds