关键词: 鱼, 华支睾吸虫, 囊蚴, 感染率, 感染度

Abstract: From March 2008 to March 2009, fishes were caught from the rivers in Sanjiang, Rongan, Rongshui, Liucheng, Liuzhou and Xiangzhou counties, and their metacercarial infections were examined by the muscle compression and digestion techniques. A total of 16 204 freshwater fishes of 35 species were collected. C. sinensis metacercariae were found in 32 species of fishes with an overall infection rate of 10.5% and a mean infection intensity of 4.6 metacercariae per gram. The highest prevalence （21.5%） and intensity of infection （9.9 per gram） were found in Pseudorasbora parva, followed by Zacco platypus （17.8% and 8.9 per gram, respectively）. There were significant differences in infection rate among different localities. The infection rate in Xiangzhou County （12.3%） was higher than that in Sanjiang County （9.1%） and Liuzhou City （9.7%）. The infection rate was higher in summer and autumn, but lower in spring and winter. Compared with low water layer, the infection rate was higher in the upper and medium water layers. The infection rates of omnivorous and herbivorous fishes were higher than that of carnivorous fishes.

Key words: Fish, Clonorchis sinensis, Metacercariae, Infection rate, Intensity of infection