Abstract

The artificial gastric-juice digestive method was used to examine 250 preserved clams, 125 living Corbicula fluminea samples, and 53 preserved fish that were all bought randomly from markets. We did not observe any metacercariae in the products bought from traditional markets. However, this does not indicate that preserved aquatic products can be sold without being cooked because, we observed that self-infected metacercariae survive for 5 minutes after being digested in fish bodies can still at a temperature of 50°C, but survive for only 1 minute when the temperature rises to 80°C. In an experimental infection study, we determined that Corbicula fluminea was not infected with xiphidiocercariae, but the fins of Opsariichthys pachycephalus can be infected and experimental metacercariae were observed. Austropeplea ollula was determined to be the first intermediate host of the xiphidiocercaria parasite, and Opsariichthys pachycephalus is a suitable second intermediate host of trematodes. Therefore, raw or insufficiently cooked, they pass down parasitic diseases.

Keywords: Gie; Metacercaria; Trematode; Opsariichthys pachycephalus