Pak J Biol Sci. 2021 Jan;24(1):19-24. doi: 10.3923/pjbs.2021.19.24.
Sessiline ciliates live as eco commensals (low numbers) and parasites (high numbers) on different hosts, like mollusks copepods, mysids and fish. Riboscyphidia ecto-protozoan is moderately pathogenic but high numbers of it on the gills can physically prevent gas exchange. The present study aimed to describe the epizoic ciliates Riboscyphidia found on the Red Sea cultured Asian sea bass and obtain more information on the Epidemiology of the parasite with special references to control and histopathological examination of naturally infected sea bass.
The occurrence of epizoic ciliates on the adult Asian Sea bass. About 100 Asian sea bass were collected by the fishing net at a private marine fish farm at Ismailia governorate and transferred to the hydrobiology laboratory at National Research Centre. A parasitological and histopathological study of epizoic sessile ciliate species was done. ANOVA test was used for Statistical analysis.
Riboscyphidia sp. was found and isolated after parasitological examination of investigated adult's Asian sea bass. The prevalence of Riboscyphidiosis was 64%. Sessile ciliates were found on gills, skin and fins. The clinical signs of Riboscyphidiosis were respiratory distress, flashing and off food. Histopathological alterations in naturally infested Asian sea bass were investigated.
The treatment of choice of Riboscyphidiosis was prolonged immersion by Copper citrate with a dose of 0.56 mg mL-1 for 7 days.
栉水母类纤毛虫以生态共生体（数量较少）和寄生虫（数量较多）的形式存在于不同的宿主上，如软体动物、桡足类、糠虾和鱼类。核糖丝虫外原生动物是中等致病性的，但大量存在于鳃上会阻碍气体交换。本研究旨在描述栉水母类纤毛虫核糖丝虫在红海养殖的亚洲海鲈上的寄生情况，并获得更多关于寄生虫流行病学的信息，特别参考对自然感染海鲈的控制和组织病理学检查。
在伊斯梅利亚省的一个私人海水鱼养殖场，用渔网收集了约 100 条成年亚洲海鲈，并将其转移到国家研究中心的水生生物学实验室。对寄生在成年亚洲海鲈上的附生固着纤毛虫种类进行了寄生虫学和组织病理学研究。采用方差分析（ANOVA）进行统计分析。
经过对调查的成年亚洲海鲈的寄生虫学检查，发现并分离出核糖丝虫。核糖丝虫病的流行率为 64%。附着纤毛虫在鳃、皮肤和鳍上发现。核糖丝虫病的临床症状为呼吸窘迫、闪烁和拒食。对自然感染亚洲海鲈进行了组织病理学改变的调查。
核糖丝虫病的治疗选择是用铜柠檬酸进行长时间浸泡，剂量为 0.56mg mL-1，持续 7 天。
