深海性魚類の重金属含量

概要

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In order to examine whether deep-sea fishes were safe to eat, heavy metal contents were determined in the muscles of 16 species caught off New Zealand and Patagonia. Heavy metal contents determined in the muscles of deeg-sea fishes were as follows: 0.04 to 0.46 ppm of total mercury, 0.02 to 0.44 ppm of methyl mercury, 0.08 to 0.46 ppm of selenium, trace to 0.03ppm of cadmium, 4.3 to 10.9ppm of zinc, trace to 0.53 ppm of lead, and 0.12 to 9.99 ppm of arsenic. The mercury contents of dory, Cyttoidopus sp., and Tarakihi, Cheilodactylus macropterus, exceeded the temporary regulatory level of mercury in fishes and shellfishes. The contents of selenium, cadmium, zinc, and arsenic in the muscles of deep-sea fishes were about the same as those of commercial fishes, but lead was present at somewhat higher levels in the muscles of deep-sea fishes. In the muscle of dory, the amounts of totalmercury and methyl mercury were found to be proportional to body weight. There exists a significant correlation between the depth of the sea where the fishes are caught and the contents of total mercury in the muscles, that is, the deeper the fishes live, the higher the contents of total mercury found in these fishes.
日本水産學會の論文