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年入600万的致富“秘籍”，曾经很火的稻田养鱼，为啥没人养了？
稻田养鱼在上世纪90年代非常火爆，曾有养殖户靠稻田养鱼年入百万，面对如此巨大的利益，不少人看到后心动不已，纷纷投入到养殖的行列当中。不过近些年来，已经很少听到稻田养鱼的消息了，这又是怎么回事呢？
科普大杂烩4/29
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