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Table 5 Relative abundance of metacercariae in 25 ponds with matching snail data (fish species represented by less than 10 specimens were grouped together as “Other”)

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

Fish species No. of fish No. of ponds Mean metacer-cariae densitya Maximum density in 1 fish Weight range (g) of fish Prevalence of FZT (%) Count ratio Odds ratio
Grass carp (Ctenopharyngodon idellus) 126 20 9.23 177.7 60–896 90.5 1.00 1.00
Indian carp (Labeo rohita) 416 25 0.23 7.4 10–720 70.2 0.02*** 0.2***
Mrigal (Cirrhinus mrigala) 153 19 0.38 9.7 30–350 79.1 0.04*** 0.38*
Pacu (Piaractus brachypomum) 31 4 0.78 5.05 20–100 90.3 0.11*** 0.87
Red-eyed carp (Squaliobarbus curriculus) 39 8 0.24 2.19 80–210 76.9 0.03*** 0.32
Silver carp (Hypophthalmichthys molitrix) 382 23 4.75 216 20–430 86.9 0.46* 0.59
Crucian carp (Carrasius auratus) 66 18 1.09 9.2 18–170 77.3 0.11*** 0.27*
Tilapia (Oreochromis niloticus) 25 7 0.59 13.8 19–210 32.0 0.06** 0.04***
Other 28 12 4.29 64 12–420 75.0 0.42 0.31
  1. Based on all fish collected in 25 fish ponds in two communes, Nhgia Lac and Nhgia Phu, in Nam Dinh province, northern Vietnam over the entire study period
  2. amean no of metacercariae per g fish; *p < 0.05; **p < 0.01; ***p < 0.001