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1 基本情况1.1 试验区概况选择山阳镇区域内713.4亩连片22个河蟹养殖塘口为试验区，该区域有以下一些特点：a.1999年及以前的发病率较高；b.塘口面积从8亩到180亩，大中小规格齐全；c.该示范区内有老塘口、新塘口、稻田养殖等，塘口类型多，塘龄长短不一；d.水源是宝应湖水系，
1 Basic situation 1.1 The experimental area Survey Select Sanyang Town area of 713.4 acres of contiguous 22 crab farming ponds for the pilot area, the area has the following characteristics: a.1999 years ago before the high rate of invasion; b. Tangkou Area from 8 acres to 180 acres, medium and small size complete specifications; c. The demonstration area Laotangkou, Xintang mouth, rice farming, pond type, pond age varies; d. ,