罗氏沼虾苗产量降低的原因分析我场养殖罗氏沼虾的历史已有三年，前几年亩产都在１５０ｋｇ左右，最高达２９０ｋｇ，而１９９５年亩产只在１００ｋｇ左右，最低只有５０ｋｇ左右。分析其原因是多方面的。一、苗种质量和数量我场今年从四个繁殖场购买了苗种，有些地方苗种... Reasons for the decrease in the production of Macrobrachium rosenbergii Mycological culture Macrobrachium history has been three years, a few years ago in 150kg per mu, up to 290kg, while in 1995 only about 100kg per mu, the lowest is only about 50kg. There are many reasons for analyzing this. First, the quality and quantity of seed My field this year from four breeding ground to buy the seed, some local seed ...