Rindoria Nehemiah Mogoi, Mungai Lewis Kamau, Yasindi Andrew Wamalwa, Otachi Elick Onyango
Department of Biological Sciences, Egerton University, P.O. Box 536, Egerton, Kenya.
Parasitol Res. 2016 Apr;115(4):1501-8. doi: 10.1007/s00436-015-4883-3. Epub 2015 Dec 22.
An investigation of gill monogeneans from the Nile tilapia Oreochromis niloticus and the blue spotted tilapia Oreochromis leucostictus (50 individuals per species) was done between the months of November 2014 to February 2015 in Lake Naivasha, Kenya. Standard parasitological procedures were used to examine fish gills for the presence of monogeneans. The observed monogeneans were collected, preliminarily identified using identification keys, quantified and fixed in 4 % formalin for morphological studies and absolute ethanol for molecular studies. Four parasite species comprising of three species of the genus Cichlidogyrus and one species of the genus Scutogyrus were recovered. Cichlidogyrus sclerosus and Cichlidogyrus tilapiae infested both fish species but the C. sclerosus was most prevalent in O. leucostictus (Prevalence (P) = 100 %, Mean intensity (MI) = 3.4) and C. tilapiae in O. niloticus (P = 8 %, MI = 4). Cichlidogyrus tilapiae had a P = 12 % and MI = 5.0 and a P = 6 % and MI = 3.0 in O. niloticus and O. leucostictus, respectively. Cichlidogyrus halli (P = 4 %, MI = 15.5) and Scutogyrus gravivaginus (P = 2 %, MI = 1.0) were only found in O. leucostictus. This is the first time that these monogeneans have been identified from Lake Naivasha, Kenya, presenting new geographical records. It was concluded that Ancyrocephalids (Cichilidogyrus spp.) dominated the two cichlid fish species in Lake Naivasha, Kenya.
2014年11月至2015年2月期间，在肯尼亚奈瓦沙湖对尼罗罗非鱼（Oreochromis niloticus）和蓝点罗非鱼（Oreochromis leucostictus）（每个物种50条个体）的鳃部单殖吸虫进行了调查。采用标准寄生虫学程序检查鱼鳃，以确定是否存在单殖吸虫。将观察到的单殖吸虫收集起来，使用鉴定检索表进行初步鉴定，进行量化，并固定在4%的福尔马林中用于形态学研究，固定在无水乙醇中用于分子研究。共发现了四种寄生虫，其中包括三种丽鲷盘虫属（Cichlidogyrus）的物种和一种盾盘虫属（Scutogyrus）的物种。硬化丽鲷盘虫（Cichlidogyrus sclerosus）和尼罗丽鲷盘虫（Cichlidogyrus tilapiae）感染了这两种鱼类，但硬化丽鲷盘虫在蓝点罗非鱼中最为常见（感染率（P）=100%，平均感染强度（MI）=3.4），尼罗丽鲷盘虫在尼罗罗非鱼中更为常见（P=8%，MI=4）。尼罗丽鲷盘虫在尼罗罗非鱼中的感染率为P=12%，MI=5.0，在蓝点罗非鱼中的感染率为P=6%，MI=3.0。哈氏丽鲷盘虫（Cichlidogyrus halli）（P=4%，MI=15.5）和重瓣盾盘虫（Scutogyrus gravivaginus）（P=2%，MI=1.0）仅在蓝点罗非鱼中发现。这是首次在肯尼亚奈瓦沙湖鉴定出这些单殖吸虫，呈现了新的地理记录。研究得出结论，锚首虫科（丽鲷盘虫属物种）在肯尼亚奈瓦沙湖的两种丽鱼科鱼类中占主导地位。
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