THÀNH PHẦN LOÀI ỐC VÀ TỈ LỆ NHIỄM CERCARIAE TRÊN ỐC TRONG RUỘNG LÚA TỪ BA NHÓM ĐẤT KHÁC NHAU Ở HUYỆN BÌNH CHÁNH, THÀNH PHỐ HỒ CHÍ MINH, VIỆT NAM

Abstract

This study was conducted on the species composition of snails in rice fields from three types of soils including alluvial soil, acrisols soil, and acid sulfate soil in Binh Chanh District, Ho Chi Minh City. It was carried out in November 2022 and February 2023. A total of 1,476 snail samples belonging to nine species, nine genera, and six families were collected and identified by the morphological method. They are Pomacea canaliculata (33.3%), Filopaludina sumatrensis (33.1%), Bithynia siamensis (14.4%) Lymnaea viridis (8.6%), Indoplanorbis exustus (7.8%), Melanoides tuberculata (1.7%), Filopaludina martensi martensi (0.7%), Thiara scabra (0.3%), and Pila ampullacea (0.1%). Total snail species in alluvial soil were seven, acrisols soil eight, and acid sulfate soil eight. Bithynia siamensis, Lymnaea viridis, Melanoides tuberculata, Filopaludina sumatrensis, Filopaludina martensi martensi and Indoplanorbis exustus were infected with cercariae.  Bithynia siamensis was found to be infected with cercariae in all three areas with a combined prevalence of 51.4%. The recovered cercariae were Xiphidio cercariae, Gymnocephala cercariae, Echinostoma revolutum, Furcocercous cercaria, and Gastrothylax crumenifer. Xiphidio cercariae was the most common. Further research on trematode prevalence in snails in different months needs to be carried out to identify snail species and cercariae infection in snails in rice fields and other water bodies to contribute to managing waterbodies for fish culture effectively.