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Table 1 Snail fauna and distribution in small water canals, rice fields and fish ponds each represented by 30 sites located in two communes, Nhgia Lac and Nhgia Phu, in Nam Dinh province, northern Vietnam

From: The role of rice fields, fish ponds and water canals for transmission of fish-borne zoonotic trematodes in aquaculture ponds in Nam Dinh Province, Vietnam

  Small canals (n = 30) Rice fields (n = 30) Fish ponds (n = 30)
Snail species No. of sites No. of snails % No. of sites No. of snails % No. of sites No. of snails %
Thiaridae          
Thiara scabra 6 1641 19.1 0 0 0.0 13 1214 10.4
Tarebia granifera 0 0 0.0 0 0 0.0 3 601 5.2
Melanoides tuberculata 13 2697 31.3 10 480 10.1 27 4637 39.9
Sermyla riquetii 2 346 4.0 1 465 9.7 5 1892 16.3
Bithynidae          
Bithynia fuchsiana 5 167 1.9 17 984 20.6 5 23 0.2
Stenothyridae          
Stenothyra messageri 11 1342 15.6 7 236 4.9 1 5 0.0
Other          
Neritina violacea 1 6 0.1 0 0 0.0 1 1 0.0
Angulyagra polyzonata 15 927 10.8 4 33 0.7 29 3202 27.5
Idiopoma umbilicata 1 6 0.1 1 4 0.1 0 0 0.0
Pila polita 0 0 0.0 0 0 0.0 2 2 0.0
Pomacea canaliculata 8 48 0.6 2 2 0.1 5 16 0.1
Pomacea insularum 9 125 1.5 9 200 4.2 7 13 0.1
Polypylis hemisphaerula 8 400 4.6 6 26 0.5 1 16 0.1
Gyraulus convexiusculus 12 864 10.0 14 461 9.7 1 5 0.0
Lymnaea spp.a 4 34 0.4 9 1878 39.3 4 6 0.1
  1. Number of sites where a species was found, the total number of snails collected and the relative abundance (in %), i.e. the contribution of each species to the total number of snails collected, are reported
  2. aA few L. swinhoei but mainly L. viridis