Prevention and Control of Fish-borne Zoonotic Trematodes in Fish Nurseries, Vietnam

Clausen, Jens; Madsen, Henry; Murrell, K. D.; Van, Phan Thi; Thu, Hà Nguyễn Thị; Trung, Dung; Thi, Lan Anh Nguyen; Manh, Hung Nguyen; Dalsgaard, Anders

doi:10.3201/eid1809.111076

Cited by 46 publications

(56 citation statements)

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“…Farmers should be provided with guidelines on how to improve their ponds. This could include removal of the top 3-5 cm of mud from the pond bottom and letting the pond dry out for several days before restocking, removal of all aquatic vegetation from the pond to reduce snails and their habitat (Clausen et al 2012). The banks of ponds could be lined with concrete to help control vegetation and possibly thereby reduce snail density (Clausen et al 2012).…”

Section: Educationmentioning

confidence: 99%

“…This could include removal of the top 3-5 cm of mud from the pond bottom and letting the pond dry out for several days before restocking, removal of all aquatic vegetation from the pond to reduce snails and their habitat (Clausen et al 2012). The banks of ponds could be lined with concrete to help control vegetation and possibly thereby reduce snail density (Clausen et al 2012). Furthermore, the inlet tube could be fitted with a mesh filter to help reduce snail entry into the pond; if the mesh size is small the mesh filter must be long, otherwise it could be clogged by mud, vegetation or waste and eventually break due to water pressure (Clausen et al 2012).…”

Section: Educationmentioning

confidence: 99%

“…The banks of ponds could be lined with concrete to help control vegetation and possibly thereby reduce snail density (Clausen et al 2012). Furthermore, the inlet tube could be fitted with a mesh filter to help reduce snail entry into the pond; if the mesh size is small the mesh filter must be long, otherwise it could be clogged by mud, vegetation or waste and eventually break due to water pressure (Clausen et al 2012). Reduction of FZT egg contamination of ponds could perhaps be achieved by constructing a 10-15 cm elevated cement barrier all along the pond bank to prevent surface runoff water from entering the pond.…”

Section: Educationmentioning

confidence: 99%

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Global status of fish-borne zoonotic trematodiasis in humans

Hùng

Madsen

Fried

2013

Acta Parasitologica

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110

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Fishborne zoonotic trematodes (FZT), infecting humans and mammals worldwide, are reviewed and options for control discussed. Fifty nine species belonging to 4 families, i.e. Opisthorchiidae (12 species), Echinostomatidae (10 species), Heterophyidae (36 species) and Nanophyetidae (1 species) are listed. Some trematodes, which are highly pathogenic for humans such as Clonorchis sinensis, Opisthorchis viverrini, O. felineus are discussed in detail, i.e. infection status in humans in endemic areas, clinical aspects, symptoms and pathology of disease caused by these flukes. Other liver fluke species of the Opisthorchiidae are briefly mentioned with information about their infection rate and geographical distribution. Intestinal flukes are reviewed at the family level. We also present information on the first and second intermediate hosts as well as on reservoir hosts and on habits of human eating raw or undercooked fish.

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Section: Educationmentioning

confidence: 99%

Section: Educationmentioning

confidence: 99%

Section: Educationmentioning

confidence: 99%

See 1 more Smart Citation

Global status of fish-borne zoonotic trematodiasis in humans

Hùng

Madsen

Fried

2013

Acta Parasitologica

Self Cite

110

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“…Chemical control of these freshwater snails is not really feasible in aquaculture installations since most chemicals that are toxic to snails (molluscicides) also are toxic to fishes (Hoffman 1970;Calumpang et al 1995). Pond management, such as regular mud removal, may reduce density of the intermediate hosts, but this may not be enough to prevent transmission (Clausen et al 2012a). Biological control of snails, however, may be a viable option and in northern Vietnam (Red River delta) many fish farmers already use the black carp, Mylopharyngodon piceus (Richardson, 1846) for snail control in grow-out ponds.…”

mentioning

confidence: 99%

“…Nursery ponds are stocked with fry (mainly carp species) from commercial hatcheries about 1 week after hatching and they will be kept in the pond for about 9 weeks (the normal duration of a nursing cycle) when the juvenile fish will be sold to for growth in a potentially large upland. During this period, the prevalence of infection with FZT may reach more than 80% (Clausen et al 2012a).…”

mentioning

confidence: 99%

Prey species and size choice of the molluscivorous fish, black carp (Mylopharyngodon piceus)

Hùng

Stauffer

Madsen

2013

Journal of Freshwater Ecology

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The black carp, Mylopharyngodon piceus, is used for biological control of freshwater mollusks in various parts of the World. Fish-borne zoonotic trematodes (FZTs) are a public health concern in Vietnam and we suggest using black carp in nursery ponds, which are important for FZT transmission, to control snails serving as first intermediate hosts. However, the use of large juvenile (>2 kg) black carp in nursery ponds could be problematic and we decided to determine consumption rates by black carp of various sizes and their choice of different sizes of selected snail species found in aquaculture ponds in northern Vietnam. Furthermore, shell strength of common snails was assessed. Average daily consumption as percentage of fish weight ranged from 8.12% for smaller fish (100-250 g) to 4.68% in the larger fish (610-1250 g). Bithynia fuchsiana, the intermediate host of Clonorchis sinensis, and some intestinal trematodes were readily consumed by even the smallest black carp tested. The proportion of Melanoides tuberculata, an important host for intestinal trematodes, declined with an increase in its shell height. The same was observed for two viviparid snail species, Angulyagra polyzonata and Sinotaia aeruginosa; these species do not serve as first intermediate host for FZTs. Small black carp (100-250 g) consumed 50.4% of the second largest size class (26-30 mm) and 19% of the largest size class (>30 mm), while medium-sized black carp consumed 49.6% of the largest M. tuberculata and almost all snails of other size classes. Large black carp consumed 75% of the largest size class (>30 mm) of M. tuberculata. Crush resistance (log e -transformed) increased linearly with shell size (log e -transformed) in most species tested. Crush resistance was the lowest in B. fuchsiana, while there was an overlap between M. tuberculata and the viviparid snails. We concluded that black carp of smaller size preferentially fed on M. tuberculata.

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Managing the threat of infectious disease in fisheries and aquaculture using structured decision making

Irwin,

Tomamichel,

Frischer

et al. 2023

Frontiers in Ecol & Environ

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Fisheries and aquaculture provide food and economic security, especially in the developing world, but both face challenges from infectious disease. Here, we consider management of disease issues from a structured decision‐making perspective to examine how infectious disease can threaten seafood production and influence management decisions. For both wild fisheries and aquaculture, disease‐management objectives generally aim to mitigate the severity and economic burden of outbreaks. General management strategies include manipulating host densities, reducing system connectivity, conserving or improving habitat, and implementing direct treatments or some other biological interventions. To inform decisions, mathematical models can be used to explore disease dynamics and to forecast the potential effectiveness of alternative management actions. Developing and implementing disease‐management strategies also involve considering uncertainties and balancing competing stakeholder interests and risk tolerances. We conclude by outlining several steps for applying structured decision making that are broadly useful to decision makers facing issues related to disease.

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Prevention and Control of Fish-borne Zoonotic Trematodes in Fish Nurseries, Vietnam

Abstract: Reducing snails and trematode eggs in nursery ponds lowered trematode transmission among fish.

Cited by 46 publications

References 20 publications

Global status of fish-borne zoonotic trematodiasis in humans

Global status of fish-borne zoonotic trematodiasis in humans

Prey species and size choice of the molluscivorous fish, black carp (Mylopharyngodon piceus)

Managing the threat of infectious disease in fisheries and aquaculture using structured decision making

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