Article (Scientific journals)
Distribution of freshwater snails in family-based VAC ponds and associated waterbosied with special reference to intermediate hosts of fish-borne zoonotic trematides in Nam Dinh province, Vietnam
Bui Thi, Dung
2010In Acta Tropica, 116, p. 15-23
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Keywords :
VAC pond, Freshwater snail; Habitat preference, intermediate host; intestinal trematode
Abstract :
[en] Fish-borne zoonotic trematodes, such as Clonorchis sinensis, heterophyids and others, constitute a public health concern in parts of northern Vietnam and infections with these trematodes are often thought to be linked to fish culture. One common fish culture system is the integrated fish-livestock (VAC) ponds where individual households have 1 or more ponds. Fish fry, mainly of various carp species, pro-duced in hatcheries, not necessarily local, are introduced into nursery ponds and after approximately 6 weeks, juvenile fishes are transferred to household ponds, referred to as grow-out ponds. Grow-out ponds are usually fertilized with organic debris, including animal excreta, to stimulate algal growth and subsequently fish growth. This paper describes the distribution of freshwater snails and occurrence of trematode infections in these in VAC ponds and associated habitats as part of a major study on risk factors of FZT infections in cultured fish in two communes, Nghia Lac and Nghia Phu, Nghia Hung District, Nam Dinh Province. The area is under intense rice cultivation with an extensive canal network supplying fields and also household VAC ponds. A total of 16 snail species was found and four were widely distributed i.e. Angulyagra polyzonata, Melanoides tuberculata, Bithynia fuchsiana and Pomacea insularum. Snail diver-sity and counts were higher in nursery ponds than in grow-out ponds. Species of the families Thiaridae and Viviparidae were more abundant than other species in VAC ponds while species of the Bithyniidae, Stenothyridae and Planorbidae dominated in rice fields and small canals. Trematode infections were found in eight snail species and among these M. tuberculata had the highest overall prevalence of infec-tion (13.28%). No trematode infections were found in species of the Viviparidae and Ampullaridae except for metacercariae. Parapleurolophocercous and pleurolophocercous cercariae constituted the most com-mon type of cercariae recovered, contributing 40.6% of all infections followed by echinostome cercariae (35.0%) and xiphidiocercariae (17.3%). Bithynia fuschiana and M. tuberculata had the most diverse trema-tode fauna. C. sinensis was not recorded in this study. The VAC pond system in this area, is very important for transmission of minute intestinal trematodes while they play little role in transmission of C. sinensis as its intermediate hosts, bithynid snails, rarely occur in these ponds. From a public health perspective this is positive as the effects of infections with intestinal trematodes are considered mild. On the other hand it is possible that even such subtle effects could have importance in public health as transmission is very intense in the area. And this in combination with the aquaculture importance, reduced marketability of fishes with high metacercariae loads, warrants that control efforts against these trematodes are initiated to reduce transmission in this production system.
Disciplines :
Biotechnology
Author, co-author :
Bui Thi, Dung ;  Université de Liège - ULiège > Doct. sc. vété. (Bologne)
Language :
English
Title :
Distribution of freshwater snails in family-based VAC ponds and associated waterbosied with special reference to intermediate hosts of fish-borne zoonotic trematides in Nam Dinh province, Vietnam
Publication date :
10 May 2010
Journal title :
Acta Tropica
ISSN :
0001-706X
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
116
Pages :
15-23
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 May 2013

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