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转基因三文鱼(个头大者)和普通三文鱼
人民网讯 美国马萨诸塞州AquaBounty Technologies公司宣布,已向加拿大客户出售了4.53吨转基因三文鱼。这意味着转基因动物食品首次正式登上了民众餐桌,其市场价格约为每斤5.90美元。
加拿大卫生部称,销售这种三文鱼的商店不必在包装上贴上转基因食物的标签。当地监管条例规定,只有当食物有可能造成健康风险,比如食物过敏或对食物的营养品质造成重大改变时才需要贴标签。
据加拿大《红枫林》周刊披露,所谓“转基因三文鱼”的祖先是大西洋三文鱼,它们在温暖水流中发育生长,3年左右才能长大。研究人员为其植入太平洋三文鱼生长基因和大洋鳕鱼的抗冻蛋白基因。
转入上述两种基因后,即便在寒冷情况下转基因三文鱼也能快速生长,只要18个月就能长大,而且个头也比同类非转基因三文鱼要大,因而可以更快、更多地满足人们的消费需求。
转基因三文鱼生长在封闭孵化场中,不会遇到海洋中网箱养殖三文鱼常见的病原体和寄生虫。这种转基因三文鱼是“三倍体无生育能力”,因此即便进入大自然也不会影响正常生态系统。(高轶军)
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