Bioaccumulation of dietary polycyclic aromatic hydrocarbons and EROD induction in the red sea bream and Java medaka.

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  • Cheikyula Joseph
    Department of Fisheries and Aquaculture, University of Agriculture The United Graduate School of Agricultural Sciences, Kagoshima University
  • Koyama Jiro
    Faculty of Fisheries, Kagoshima University
  • Uno Seiichi
    Faculty of Fisheries, Kagoshima University

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Bioaccumulation and hepatic EROD induction were investigated in the red sea bream and Java medaka exposed to dietary-borne PAHs and compared to a previous water-borne exposure. <BR>Of the four test PAHs, phenanthrene, pyrene, and chrysene were detected in the red sea bream liver and muscles, benzo[a]pyrene was detected only in the muscles. All accumulations decreased with time. In the water-borne exposure for red sea bream, only phenanthrene and pyrene were accumulated and concentrations increased with exposure duration. The Java medaka accumulated all the 4 PAHs as in the water-borne exposure with the same trend.<BR> Hepatic EROD activity in both species increased 3-100 folds over control. Red sea bream inductions were comparable to the water-borne inductions, and they persisted during the depuration period. Java medaka inductions were not significantly different from the water-borne exposure and they declined in the depuration.<BR> These results suggest that high molecular weight PAHs like chrysene and benzo[a]pyrene can be accumulated by red sea bream through the food chain, but the low molecular weight PAHs will be readily accumulated through water. Irrespective of the uptake route, the Java medaka can accumulate all the four PAHs. It seems PAH uptake route did not influence hepatic EROD induction.

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