Fate of mercury and selenium contained in fish in the recycle of fishery product wastes

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In the recycle of fishery product wastes, the fate of mercury and selenium was investigated on the viewpoint of the generation of hazardous free species.Although the methylmercury species contained in fish meat was stabilized and detoxified by selenoprotein, it was clarified that free methylmercury and low-molecular selenium species were generated when the fish meat was subjected to a hydrothermal treatment (subcritical water treatment). Also, it was found that the demethylation of methylmercuryas well as the vaporization of selenium occurred during fermentation (compost) processes.