水銀の生物的濃縮に関する実験的研究-I : マアジーブリ幼魚という食物連鎖における水銀の転移率について

概要

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In this report, the rate of mercury transfer through the food chain from jack mackerel, Trachrus japonicus, to yellowtail, Seriola quinqueradiata, was calculated.After rearing in methylmercury dosed sea water, jack mackerels were fed to tagged yellowtail for 18 days maintaining normal feeding and growth rate. On the basis of the relationship between body weight and total amount of mercury of the reared jack mackerels, the total amount of mercury incorporated by the yellowtail was determined. The rate of mercury transfer was calculated from the remaining mercury in the yellowtail and the total.The calculated value was very high: 66 ?? 103% (ave. 88%). As the percentage of the methylmercury in the total mercury of the reared jack mackerels, was not different from that one in nature, this calculated value may be applied to this food chain in nature. The food chain seems to play an important role in the biological concentration of mercury.