PDF(Pubmed)
Abstract：
Despite the importance of the electric catfish (Malapterurus electricus) and the African giant catfish (Heterobranchus bidorsalis) in the foodweb of Lake Nasser, Egypt, little is known about their diseases and parasitic fauna. This work describes, for the first time, cestodiasis in M. electricus and H. bidorsalis. Corallobothrium solidum and Proteocephalus sp. were identified morphologically and molecularly from M. electricus and H. bidorsalis, respectively. Using PCR, sequencing, and phylogenetic analysis, the two cestodes shared rRNA gene sequence similarities yet were unique and the two new sequences for the proteocephalid genera were submitted to the GenBank database. The prevalence of infection was 75% and 40% for the two fish species, respectively. Infections significantly increased in the summer and spring and were higher in female fish than in male fish. The intestine was the preferred site of the two adult cestodes. However, in the case of C. solidum some larval cestodes were found outside the intestine in between the skin and abdominal musculature, attached to the mesentery, and within intestinal tunica muscularis. Desquamation of the intestinal epithelium and inflammation at the site of infection in addition to congestion of the intestinal wall of the tapeworm infected fish were evident, indicating that C. solidum and Proteocephalus sp. impacted the infected fish. The larval stages of C. solidum attempted to penetrate the intestine and sometimes they were encircled within fibrous layers infiltrated with inflammatory cells. The infected fish\'s musculature was free of cestode infections. Preventive measures should be implemented to prevent the spread of infections.
摘要：
尽管在纳赛尔湖的食物网中，电cat鱼（Malapteruruselectricus）和非洲巨型cat鱼（Heterobranchusbidorsalis）很重要，埃及,人们对他们的疾病和寄生动物知之甚少。这项工作描述了，第一次,在M.electricus和H.bidorsalis。固着珊瑚和变形杆菌。从形态和分子上鉴定了电工支原体和双头螺旋体，分别。使用PCR，测序,测序和系统发育分析，这两个cestodes共享rRNA基因序列相似性，但却是唯一的，并且蛋白类属的两个新序列已提交给GenBank数据库。两种鱼类的感染率分别为75％和40％，分别。夏季和春季的感染显着增加，雌性鱼的感染高于雄性鱼。肠是两个成年c虫的首选部位。然而,在C.solidum的情况下，在皮肤和腹部肌肉组织之间的肠道外发现了一些幼虫。连接到肠系膜,和肠道肌层内。感染地点的肠上皮脱皮和炎症，除了tape虫感染的鱼的肠壁充血外，表明C.solidum和Proteocephalussp.影响了被感染的鱼。C.solidum的幼虫阶段试图穿透肠道，有时它们被包裹在浸润有炎症细胞的纤维层中。受感染的鱼的肌肉组织没有c虫感染。应采取预防措施，防止感染的传播。
