EM是有益微生物群的英文缩写，由日本琉球大学比嘉照夫教授发明。EM可广泛应用于种植业、养殖业、环境保护、人体保健等领域。为验证EM在露天水产养殖池塘中的应用效果，我们于1998和1999年两年选择青虾和常规鱼养殖池进行了试验，现将试验的情况总结如下：一、试验设计和实施 EM is an acronym for beneficial microbiota invented by Professor Ryuga Kaju from Ryukyu University in Japan. EM can be widely used in planting, aquaculture, environmental protection, human health and other fields. In order to verify the application of EM in open-air aquaculture ponds, we selected freshwater shrimp and conventional fish ponds in 1998 and 1999 for two years. The test results are summarized as follows: 1. Experimental Design and Implementation