近年来，由于市场饲料等原因，大部分北方地区的养殖户反映养殖效益不高，有时甚至赔钱。本人根据自己的养殖体会和所见所闻，就提高北方淡水池塘养殖经济效益提出以下几点建议。　　一、进行鲤鱼的双茬鱼养殖　　尽管鲤鱼的销量呈日益减少的趋势，又由于鲤鱼属吃食性鱼类，国? In recent years, due to market feed and other reasons, most farmers in the northern region have reported poor breeding benefits and sometimes lost money. I based on their own farming experience and what I saw and heard about the northern freshwater ponds to raise economic efficiency made the following suggestions. First, the carp double-stubble fish farming Although carp sales showed a declining trend, but also due to carp is a food fish, the country?