《Table 3 Qualitative risk ranking of mercury in predaceous fish》

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《鱼贝类水产品甲基汞摄入风险评估的研究进展（英文）》

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The general steps for risk assessment of fish and shellfish are shown in Fig.2[25].Pregnant women，especially pregnant women in their first trimester，are at high risk for methylmercury intake from aquatic products due to the negatively impact of methylmercury on normal fetal development.According to the allowable mercury intake of 0.7μg/kg body weight/week recommended by the US EPA and 5μg/kg body weight/week recommended by the Joint FAO/WHO Expert Committee on Food Additives（JECFA），the weekly limit of mercury intake from fish and shellfish for a 60-kg-weight pregnant in their first trimester is calculated and showed in Table 2.JECFA&apos；s limit is almost seven times that of EPA，but most countries use the JECFA&apos；s as standard.The expert committees of Food and Agriculture Organization（FAO）and World Health Organization（WHO）have developed quantitative measures of provisional tolerable weekly intake（PTWI）for food-borne mercury intake，suggesting that each person could tolerate 300μg total mercury or no more than 100μg methylmercury per week.This index is strict compared with the EPA index[1，2，4].To assess the extent of methylmercury intake based on fish and shellfish，the PTWI is used as a measure of methylmercury in this study.