从患病大鲵肝脏中分离到1株优势菌SX01,通过Biolog微生物自动鉴定系统、16S rDNA序列分析及构建系统发育树的方法对纯培养的细菌进行鉴定,并进行人工感染试验及药敏试验。结果表明,该分离菌为摩氏摩根菌(Morganella morganii),对大鲵具有致病性。药物敏感性试验表明,该菌株对头孢曲松、头孢吡肟、氨曲南等10种药物高度敏感。 One dominant strain, SX01, was isolated from the liver of diseased mackerel. The purely cultured bacteria were identified by Biolog automatic identification system, 16S rDNA sequence analysis and phylogenetic tree. The artificial infection test and drug susceptibility test were performed. The results showed that the isolated strain was Morganella morganii, which was pathogenic to Daphnida. Drug sensitivity test showed that the strain was highly sensitive to ceftriaxone, cefepime, aztreonam and other 10 drugs.