诸暨市王家井镇养鱼大户周国军，承包鱼塘70亩，经济效益随着科学技术知识的提高日益显著。1996年他改养青虾30亩，亩产达70－75公斤，其中商品虾平均50公斤，一季亩利润达2000元，加上鲜鱼产量70公斤，总利润为2300元；光虾塘收入即达6．9万元。他设想每亩留养20－25公斤JJ、 Zhouji Jun, a large fish farmer in Wangjiarui Town, Zhuji City, has contracted 70 mu of fish ponds, and its economic benefits have become increasingly prominent with the improvement of scientific and technological knowledge. In 1996, he cultivated 30 hectares of freshwater shrimp and produced 70-75 kilograms of mussels per mu, of which 50 hectares were commercial shrimp and 2,000 hectares per mu in the first quarter. Together with 70 kilograms of fresh fish, his total profit was 2,300 yuan. That is 69,000 yuan. He envisaged to keep 20-25 kg per mu JJ,