An investigation on the diseases of adult prawn (Macrobrachium rosenbergii) had been conducted from August 2009 to August 2010 in farms in the Yangtze River Delta region. The symptoms found in various localities, which were mainly divided into three categories; Shanghai and Zhejiang disease sample has pale body color, especially the tail with white spots; Jiangsu disease sample mainly has blue body-color and blue muscle; Zhejiang disease sample has red body-color, and reddish hepatopancreas. 11 strains of dominant bacteria were isolated from the disease samples of M. Rosenbergii, and 3 main pathogenic bacteria were selected by infecting healthy M. Rosenbergii artificially, namely SHB1, GYB8, HZL2. After morphological, physiological and biochemical properties and 16SrRNA identification, the 3 bacteria were determined as Aeromonas hydrophila, Citrobacter freundii, Proteus vulgaris. Conventional drug susceptibility tests showed that the 3 main pathogenic bacteria and other isolated bacteria had high sensitivity to ciprofloxacin and enrofloxacin.%2009年8月-2010年8月在长三角地区开展了罗氏沼虾(Macrobrachium rosenbergii)成虾主要疾病的流行病学调查.结果显示:所采集病样按其症状分为肌肉白浊病(以上海和浙江病样为主)、蓝体病(以江苏病样为主)、红体病(以浙江病样为主)三类.从采集的罗氏沼虾病样中分离到优势细菌11株,人工感染健康罗氏沼虾,筛选出3株主要致病菌,分别命名为SHB1,GYB8,HZL2.经形态学、生理生化特性及16 S rRNA鉴定,确定3株主要致病菌依次为嗜水气单胞菌(Aeromonas hydrophila),费氏柠檬酸杆菌(Citrobacter freundii)、普通变形杆菌(Proteus vulgaris).常规药物敏感性试验表明,3种主要致病菌以及其它分离株细菌对环丙沙星和恩诺沙星高度敏感.
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