Infections of Digenetic Trematode Metacercariae in Wrestling Halfbeak, Dermogenys pusilla from Bangkok Metropolitan Region in Thailand

Abstract

This study aimed to investigate metacercarial infections in the wrestling halfbeak, <i>Dermogenys pusilla</i>, collected from Bangkok metropolitan region of Thailand. A total of 4,501 fish from 78 study sites were commonly examined with muscle compression and digestion methods (only head part of fish) during September 2017 to July 2018. The overall prevalence of metacercarial infection was 86.1% (3,876/4,501 individuals), and the mean intensity was 48.9 metacercariae per fish infected. Four species, i.e., <i>Posthodiplostomum</i> sp., <i>Stellantchasmus falcatus</i>, Cyathocotylidae fam. sp., and <i>Centrocestus formosanus</i>, of digenetic trematode metacercariae (DTM) were detected. The prevalences were 65.8%, 52.0%, 2.1%, and 1.2%, respectively and their mean intensities were 23.1, 51.6, 1.4, and 3.2 per fish infected, respectively. The seasonal prevalences were 81.0% in winter, 87.8% in summer and 87.4% in rainy, and the mean intensities were 38.9, 46.6, and 55.2 metacercariae per fish infected, respectively. Conclusively, it was confirmed that the wrestling halfbeak play the role of second intermediate hosts of 4 species of digenetic trematodes including <i>S. falcatus</i> and <i>Posthodiplostomum</i> sp. in Bangkok metropolitan region. And then the metacercariae of <i>C. formosanus</i> and Cyathocotylidae fam. sp. are to be first found in the wrestling halfbeak by this study.

Prevalence of fish-borne zoonotic parasites and their molecular identification in Bhola district of Bangladesh

“…It was reveals 58% overall prevalence of FBZP in fresh water fishes of Bhola district which are consistent with the results reported previously in the country where overall prevalence recorded 66% (Labony et al 2020). Our findings are also in agreement with the earlier findings where 86.1% prevalence of metacercariae were detected in the wrestling halfbeak, Dermogenys pusilla, collected from Bangkok metropolitan region of Thailand (Patarwut et al 2020). In our study, the MC of Clonorchis/Opisthorchis were detected from Loitta, spotted snakehead and stinging cat fish which suggests that these fishes act as the second intermediate hosts of opisthorchid flukes.…”

Cercarial trematodes in freshwater snails from Bangkok, Thailand: prevalence, morphological and molecular studies and human parasite perspective

“…With regards to the study area, Patarwut et al (2020) recently reported the infections of metacercaria-stage Posthodiplostomum sp. (diplostomatid) and Cyathocotylidae sp.…”

High diversity of trematode metacercariae that parasitize freshwater gastropods in Bangkok, Thailand, and their infective situations, morphologies and phylogenetic relationships

“…Investigations of trematode metacercariae infecting freshwater animals in Thailand have usually been performed in fish hosts (Wongsawad et al ., 2000; Mard-arhin et al ., 2001; Nithiuthai et al ., 2002; Krailas et al ., 2004, 2016; Kumchoo et al ., 2005; Pinlaor et al ., 2013; Suanyuk et al ., 2013; Namsanor et al ., 2020; Patarwut et al ., 2020; Charoensuk et al ., 2022); on the other hand, freshwater snails have occasionally been mentioned as intermediate hosts of the metacercariae (Chantima et al ., 2013, 2018; Noikong et al ., 2014; Phalee et al ., 2018; Bunchom et al ., 2020). In terms of biodiversity, the current study demonstrated a variety of metacercarial trematode larvae infecting snail intermediate hosts in Bangkok areas, as well as a variety of gastropod faunas distributed in freshwater habitats in Bangkok.…”