水銀の生物的濃縮に関する実験的研究-2-ブリ幼魚中の水銀の由来について

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This investigation was conducted in order to clarify the relative proportion of mercury accumulated directly from sea water against that transfered through the food chain to a predator. In the first phase of this study, the rate of mercury bioconcentration in the food chain between anchovy, Engraulis japonica, and young yellowtail, Seriora quinqueradiata, was experimentally calculated because this chain is the main route of energy flow in the fish community of Sendai Bay. Based upon this calculated value for the rate of mercury bioconcentration in the food chain (67%) and the results obtained for the food consumption of yellowtail in Sendai Bay, the mercury accumulation curve of growing yellowtail fed on anchovies containing various known amounts of mercury was calculated on the assumption that the mercury in the predator was supplied only through food chain. In the next phase, the mercury concentration in yellowtail at several growth stages collected from Sendai Bay were plotted on this figure and the theoretical mercury concentration of anchovy eaten by those yellowtail was conjectured. From the difference between this theoretical value and the actual value of anchovy' collected in Sendai Bay, the relative proportion of the mercury of the mercury uptaken directly from sea water in the mercury contained in yellow tail was evaluàted indirectly. It was found that the amount of mercury transfered through the food chain, plays a more significant role in bioconcentration of the mercury in predators such as young yellowtail than that amount accumulated directly from sea water.
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水銀の生物的濃縮に関する実験的研究-2-ブリ幼魚中の水銀の由来について

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