アサリの部位別水銀蓄積〔英文〕

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After the rearing of short-necked clams Tapes japonica in sea water containing mercury chloride (HgCl2) or methyl mercury chloride (MeHgCl), the accumulation of mercury was examined with seven different tissues (adductor muscle, foot, mantle, siphon, gill, mid-gut gland, and others). Two tissues, gill and mid-gut gland, exhibited a remarkably higher accumulation of mercury than the other tissues. Moreover, regardless of the tissues, much higher accumulation of mercury was found in the case of rearing in MeHgCl-containing sea water, than in the case of rearing in HgCl2-containing sea water. When reared in HgCl2-containing sea water, only inorganic mercury was accumulated in shellfish. On the other hand, when reared in MeHgCl-containing sea water, about a half of the mercury accumulated in shellfish was MeHg and the rest inorganic mercury, indicating that MeHgCl ingested by shellfish is partly converted into inorganic mercury by rapid demethylation in shellfish themselves. Unlike in the case of mammals, no metallothionein was produced in shellfish as they ingested mercury.
日本水産學會の論文