Metacercaria Infection Status of Fishborne Zoonotic Trematodes, Except for Clonorchis sinensis in Fish from the Heilongjiang Province, China

Abstract To investigate the metacercarial infections of fishborne zoonotic trematodes (FZT), a total of 6815 freshwater fish (in representing 13 species of 5 families) were collected from Songhua river (n = 2636), Nenjiang river (n = 1935), Mudanjiang river (n = 301), and other lakes or ponds (n = 1943) in 36 representative regions in Heilongjiang Province, China, from August 2012 to December 2015. Metacercariae of four FZT species, that is, Clonorchis sinensis, Metorchis orientalis, Isthmiophora hortensis, and Metagonimus yokogawai, metacercariae were detected in the examination by the artificial digestion method. As the partial data for C. sinensis were previously reported, the remaining three FZT species are to be treated in this study. The overall prevalence of M. orientalis, I. hortensis, and M. yokogawai, metacercariae was 10.54%, 0.28%, and 1.35%, respectively. Metacercariae of M. orientalis were detected in seven fish species, that is, Pseudorasbora parva, Hemiculter leucisculus, Saurogobio dabryi...