Abstract:

In order to know the infection status of parasite in aquatic products sold in Qiqihar, 14 species of freshwater fishes, molluscs, arthropods and amphibians were collected from this area during August to November, 2018. Fish samples were examined for trematode metacercaria by direct slide examination under microscope. The parasite species were identified under microscope. In this survey, Total 450 fishes within 7 species were examined, 32.4% of them were infected with different trematode metacercaria. Total five species of trematode metacercaria were identified including Clonorchis sinensis, Metorchis taiwanensis, Metagonimus yokogawai and Metorchis taiwanensis and one unknown. The infection rates of trematode metacercaria in 7 species of freshwater fish were Phoxinus lagowskii (75.3%), Carassius auratus (42.2%), Perccottus glenii (24.5%), Pseudorasbora parva (23.6%), Cyprinus carpio (4.8%), Hemiculter leucisculus (4.4%) and Pseudobagrus fulvidraco (0). In molluscs, the infection rates of trematode in Procambarus clarkii and Unionidae were 8.3% (7/84) and 15.0% (3/20). The total infection rate of helminth in frog Rana nigromaculata was 42.9% with trematode Diplodiscus mehrai and an unknown nematode identified in its intestine. No parasite was identified in Lithobates catesbeiana, Macrobranchium nipponense, Brachyura and Oratosquilla oratoria. The survey showed that it is common to find the helminth infections in the aquatic products sold in Qiqihar area and people and local CDC should pay attention to the food safety.

Key words: Aquatic products, Food-borne parasite, Trematode metacercaria, Infection