Mahmoud Nisreen E, Fahmy Magdy M, Abuowarda Mai M
Department of Parasitolgy, Faculty of Veterinary Medicine, Cairo University, Giza, 12211 Egypt.
J Parasit Dis. 2020 Jun;44(2):289-298. doi: 10.1007/s12639-020-01194-9. Epub 2020 Feb 12.
Cymothoidae, Leach, 1818 (Crustacea: Isopoda) are ectoparasites of marine, brackish and freshwater fishes that are reported to induce deleterious tissue impacts on the infested fish hosts. The present study aimed for the first-time screening of collected from the red sea fish in Egypt. Surveillance study was conducted for isopod infestation among the Red Sea fish revealing a total infestation rate of 40.96% with the species identified as . The parasite species was isolated from the branchial cavity and gills. Morphometric description was estimated using dissecting stereo-microscope, and scanning electron microscope (SEM) provided new additional features for the isolated species including the microtrich sensillum in the body cuticle and the fine structure of the mouth parts and body appendages. Mitochondrial gene of female isolated in the present study from was detected for the first time in Egypt and recorded in the GenBank (MK168807). The study showed that the detected isopod species represents one monophyletic group closely affiliated to the genospecies of , and can be distinguished clearly from other isopods genospecies. Based on the genetic distance values, lower level of genetic divergence was indicated within the genospecies of the present isolated from Egypt and the same species isolated from India. The present investigation recorded fish as a new host for the isopod in Egypt and provided additional morphological features through SEM as well as molecular characterization of this isopod species for the first time.
1818年利奇定名的缩头水虱科（甲壳纲：等足目）是海洋、咸淡水和淡水鱼类的体外寄生虫，据报道会对受感染的鱼类宿主造成有害的组织影响。本研究旨在首次对从埃及红海鱼类采集的缩头水虱进行筛查。对红海鱼类的等足类寄生虫感染情况进行了监测研究，结果显示总感染率为40.96%，所鉴定的物种为[具体物种名称未给出]。该寄生虫物种是从鳃腔和鳃中分离出来的。使用解剖立体显微镜进行形态测量描述，扫描电子显微镜（SEM）为分离出的物种提供了新的额外特征，包括体表角质层中的微毛感觉器以及口器和身体附肢的精细结构。本研究中从[具体宿主名称未给出]分离出的雌性缩头水虱的线粒体[具体基因名称未给出]基因在埃及首次被检测到，并记录在GenBank（MK168807）中。研究表明，检测到的等足类物种代表一个单系群，与[具体属种名称未给出]的基因种密切相关，并且可以与其他等足类基因种清楚地区分开来。根据遗传距离值，表明从埃及分离出的本[具体物种名称未给出]基因种与从印度分离出的同一物种之间的遗传分化水平较低。本调查记录了[具体宿主名称未给出]鱼是埃及缩头水虱的新宿主，并首次通过扫描电子显微镜提供了额外的形态特征以及该等足类物种的分子特征。
