Abou Zaid Attia A, Younes Abdelgayed M, Desouky Abdelrazek Y, El-Seify Mahmoud A
Department of Aquaculture, Faculty of Aquatic and Fisheries Sciences, Kafrelsheikh University, Kafrelsheikh, Egypt.
Hydrobiology Department, Veterinary Research Division, National Research Centre, Dokki, Egypt.
J Parasit Dis. 2021 Sep;45(3):831-837. doi: 10.1007/s12639-021-01364-3. Epub 2021 Mar 9.
The genus is the second largest within the class Myxosporea, which infects marine and freshwater fish. One hundred specimens were collected alive from a branch of the Nile River in Kafrelsheikh, Egypt. Microscopic and molecular procedures were used to describe how infects the ovaries of . The infected fish showed no pathogenic changes except for macroscopic creamy whitish nodules in their ovaries with the highest prevalence during the spring season. The mature spores are spindle-shaped. The total spore length, spore body length and width are 53.4 ± 0.8 (52.5-54.3) µm, 29.8 ± 0.5 (29.2-30.4) µm and 6.5 ± 0.3 (6.1-6.9) µm, respectively. The spore anterior end consisted of two equal polar capsules, located in a tandem position, each one measuring 4.2 × 2.1 µm. The polar filament formed a coil with 6-8 turns. The measurement of the spore end with two extended processes was 24.3 ± 0.4 (23.9-24.8) µm. Phylogenetic analyses of the 18S ribosomal RNA gene sequence revealed that are clustered together with other myxobolids that are histozoic in channel catfish, , and Asian Redtail catfish, " (Clariidae) in the United States and Malaysia, respectively. To the best of our knowledge, this is the first record of in Egypt. Additionally, our study is the first record of in the ovaries of .
该属是粘孢子虫纲中第二大属，可感染海洋和淡水鱼类。从埃及卡夫尔谢赫的尼罗河一条支流中采集了100个活体标本。运用显微镜和分子生物学方法来描述该属如何感染某种鱼类的卵巢。被感染的鱼除了卵巢上有肉眼可见的奶油色白色结节外，未表现出致病变化，且在春季患病率最高。成熟孢子呈纺锤形。孢子总长度、孢子体长度和宽度分别为53.4±0.8（52.5 - 54.3）微米、29.8±0.5（29.2 - 30.4）微米和6.5±0.3（6.1 - 6.9）微米。孢子前端由两个相等的极囊组成，呈串联排列，每个极囊大小为4.2×2.1微米。极丝形成6 - 8圈的螺旋。带有两个延长突起的孢子末端长度为24.3±0.4（23.9 - 24.8）微米。对18S核糖体RNA基因序列的系统发育分析表明，该属与其他粘体虫聚集在一起，这些粘体虫分别在美国和马来西亚的沟鲶、某种鱼类以及亚洲红尾鲶（胡子鲶科）体内营组织寄生。据我们所知，这是该属在埃及的首次记录。此外，我们的研究是该属在某种鱼类卵巢中的首次记录。
