人工养殖鱼类证明清白

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由于担心某些近海鱼类含有高浓度的重金属,如汞,二月份发表在《食品科学杂志》上的一项研究表明,人工养殖鱼类是安全的。在为期三年的时间里,普渡大学的查尔斯·桑特雷及其同事测试了美国南部各地水产养殖设施中生长的鲶鱼、鳟鱼和小龙虾的金属含量。这些鱼类中汞的含量平均比美国食品和药物管理局设定的一百万分之一的限量低 40 到 100 倍。同样,该团队去年报告称,在同类鱼类中发现了极低水平的 34 种农药。

鲶鱼是美国主要的商业养殖鱼类,占 1998-99 年鱼类总产量的 70%。鳟鱼约占国内水产养殖产量的 10%。桑特雷指出:“由于几乎所有从杂货店和餐馆购买的鲶鱼和鳟鱼都是人工养殖的,消费者应该继续享用这些产品并从中受益。” 但他警告说,在许多州的当地河流、溪流和湖泊中捕获的鱼类已被发现含有高浓度的汞和其他有害污染物——钓鱼者应该注意这一点,特别是对于对这些污染物特别敏感的儿童而言。

桑特雷观察到:“保护未出生的孩子也很重要。这是污染物可能对孩子的健康和发育产生最大影响的生命阶段。某些污染物(如多氯联苯)的残留物可能会在女性体内储存六年多,然后通过胎盘和母乳传递给孩子。我担心那些出于好意的钓鱼者可能会把受污染的鱼带回家喂给家人。”

Kate Wong is an award-winning science writer and senior editor at 大众科学 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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