Zoology Department, College of Science, King Saud University, Saudi Arabia, P.O. Box 2455, Riyadh 11451, Saudi Arabia ; Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.
Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.
Saudi J Biol Sci. 2015 Sep;22(5):539-42. doi: 10.1016/j.sjbs.2015.01.003. Epub 2015 Jan 19.
The present study was carried out as part of an ongoing general survey for myxosporean parasites infecting tilapias in the River Nile, Egypt. In the present study, 77 Nile tilapia (Oreochromis niloticus) were collected from boat landing sites at Beni-Suef governorate, Egypt and examined for the myxosporean infection. The infection was encountered as a huge number of free spores in the kidney and the spleen. The infection showed a prevalence of 51.9% (40/77) for Myxobolus brachysporus while it was 25.9% (20/77) for Myxobolus israelensis. Mature spores of M. brachysporus were ellipsoidal and measured 8.6 × 13.2 μm. The polar capsules were subcircular with 5-6 filament turns and measured 4.7 × 3.6 μm. Spores of M. israelensis were ellipsoidal in the frontal view and fusiform in the lateral view. Spore measurements were 13.4 μm long and 8.7 μm wide. The polar capsules were elongated with 6-7 filament coils and measured 8.6 × 3.1 μm. The findings presented here proved that tilapia fishes in the Nile River are still suffering from infections with Myxobolus species. Therefore, further studies should be carried out to survey the Myxobolus infection among tilapias under culture conditions to clarify the pathological impacts of this parasite in tilapias aquaculture.
本研究是对埃及尼罗河流域感染罗非鱼的粘孢子虫进行的一项正在进行的综合调查的一部分。在本研究中，从埃及贝尼苏夫省的船只登陆点采集了 77 条尼罗罗非鱼（Oreochromis niloticus），并检查了粘孢子虫感染情况。在肾脏和脾脏中发现了大量自由孢子，感染非常严重。感染Myxobolus brachysporus 的流行率为 51.9%（40/77），而感染Myxobolus israelensis 的流行率为 25.9%（20/77）。M. brachysporus 的成熟孢子呈椭圆形，大小为 8.6×13.2μm。极囊呈近圆形，有 5-6 圈纤毛，大小为 4.7×3.6μm。M. israelensis 的孢子在额面观呈椭圆形，在侧面观呈梭形。孢子测量值为 13.4μm 长，8.7μm 宽。极囊呈长形，有 6-7 圈纤毛，大小为 8.6×3.1μm。本研究结果表明，尼罗河流域的罗非鱼仍受到粘孢子虫感染。因此，应进一步开展研究，调查养殖条件下罗非鱼中的粘孢子虫感染情况，以阐明该寄生虫对罗非鱼养殖的病理影响。
