The biological control of snail intermediate hosts of schistosomiasis by fish

Slootweg, Roel; Malek, Emile A.; McCullough, Fergus S.

doi:10.1007/bf00043261

Cited by 49 publications

(39 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the use of fish for biological control of freshwater snails often has failed elsewhere in Africa (Slootweg et al 1994;Slootweg 1995), this should not happen in the case of T. placodon in Lake Malawi, because food availability for the fishes or interactions with other species are likely to remain constant. Attempts should be made therefore through government extension workers to introduce a community enforced shallow water fishing ban.…”

Section: Discussionmentioning

confidence: 96%

“…Aquaculture using polyculture including molluscivore species might not control the intermediate host snails although Chiotha et al (1991a, b) have demonstrated that a mix culture that included T. placodon significantly reduced density of intermediate hosts. Experience from Cameroon and elsewhere was not promising because soft food items might be abundant in inland waters and molluscivores might shift to such food items and this can lead to reduction in the crushing mill reducing their ability to crush snails (Slootweg et al 1994). It may be necessary to control access to the fish ponds such that they do not become transmission sites even if they sustain dense populations of intermediate host snails.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Density of Trematocranus placodon (Pisces: Cichlidae): A Predictor of Density of the Schistosome Intermediate Host, Bulinus nyassanus (Gastropoda: Planorbidae), in Lake Malaŵi

Madsen

Stauffer

2011

EcoHealth

View full text Add to dashboard Cite

From the mid-1980s, we recorded a significant increase in urinary schistosomiasis infection rate and transmission among inhabitants of lakeshore communities in the southern part of Lake Malaŵi, particularly on Nankumba peninsula in Mangochi District. We suggested that the increase was due to over-fishing, which reduced the density of snail-eating fishes, thereby allowing schistosome intermediate host snails to increase to higher densities. In this article, we collected data to test this hypothesis. The density of both Bulinus nyassanus, the intermediate host of Schistosoma haematobium, and Melanoides spp. was negatively related to density of Trematocranus placodon, the most common of the snail-eating fishes in the shallow water of Lake Malaŵi. Both these snails are consumed by T. placodon. Transmission of S. haematobium through B. nyassanus only occurs in the southern part of the lake and only at villages where high density of the intermediate host is found relatively close to the shore. Thus, we believe that implementation of an effective fish ban up to 100-m offshore along these specific shorelines in front of villages would allow populations of T. placodon to increase in density and this would lead to reduced density of B. nyassanus and possibly schistosome transmission. To reduce dependence on natural fish populations in the lake and still maintain a source of high quality food, culture of indigenous fishes may be a viable alternative.

show abstract

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Density of Trematocranus placodon (Pisces: Cichlidae): A Predictor of Density of the Schistosome Intermediate Host, Bulinus nyassanus (Gastropoda: Planorbidae), in Lake Malaŵi

Madsen

Stauffer

2011

EcoHealth

View full text Add to dashboard Cite

show abstract

“…The use of biological control to regulate parasitic infections of fish has been suggested (Costello 1996;Slootweg et al 1994), and initial experimental trials with M. cerebralis have evaluated the effects of mixing T. tubifex of different lineages with varying susceptibilities (Beauchamp et al 2006). In the current study, we suggest that similar effects in reducing overall parasite infectivity with M. cerebralis may occur even when cohabiting different phenotypes from the same lineage.…”

Section: Discussionmentioning

confidence: 99%

Arrested development of the myxozoan parasite, Myxobolus cerebralis, in certain populations of mitochondrial 16S lineage III Tubifex tubifex

et al. 2007

View full text Add to dashboard Cite

Laboratory populations of Tubifex tubifex from mitochondrial (mt)16S ribosomal DNA (rDNA) lineage III were generated from single cocoons of adult worms releasing the triactinomyxon stages (TAMs) of the myxozoan parasite, Myxobolus cerebralis. Subsequent worm populations from these cocoons, referred to as clonal lines, were tested for susceptibility to infection with the myxospore stages of M. cerebralis. Development and release of TAMs occurred in five clonal lines, while four clonal lines showed immature parasitic forms that were not expelled from the worm (non-TAM producers). Oligochaetes from TAM- and non-TAM-producing clonal lines were confirmed as lineage III based on mt16S rDNA and internal transcribed spacer region 1 (ITS1) sequences, but these genes did not differentiate these phenotypes. In contrast, random amplified polymorphic DNA analyses of genomic DNA demonstrated unique banding patterns that distinguished the phenotypes. Cohabitation of parasite-exposed TAM- and non-TAM-producing phenotypes showed an overall decrease in expected TAM production compared to the same exposure dose of the TAM-producing phenotype without cohabitation. These studies suggest that differences in susceptibility to parasite infection can occur in genetically similar T. tubifex populations, and their coexistence may affect overall M. cerebralis production, a factor that may influence the severity of whirling disease in wild trout populations.

show abstract

“…Biological control methods have been eVectively used to prevent and even eradicate vector-borne diseases (Costello, 1996;Slootweg et al, 1994). Biological control may be less environmentally disruptive, and organisms capable of competitively displacing aquatic pests such as zebra mussels, (Dreissena polymorpha) are now viewed as alternative strategies to physical or chemical control methods (Molloy, 1993;Molloy et al, 1997).…”

Section: Introductionmentioning

confidence: 98%

The effect of cohabitation of Tubifex tubifex (Oligochaeta: Tubificidae) populations on infections to Myxobolus cerebralis (Myxozoa: Myxobolidae)

Beauchamp

El-Matbouli²,

Gay

et al. 2006

Journal of Invertebrate Pathology

View full text Add to dashboard Cite

The biological control of snail intermediate hosts of schistosomiasis by fish

Cited by 49 publications

References 42 publications

Density of Trematocranus placodon (Pisces: Cichlidae): A Predictor of Density of the Schistosome Intermediate Host, Bulinus nyassanus (Gastropoda: Planorbidae), in Lake Malaŵi

Density of Trematocranus placodon (Pisces: Cichlidae): A Predictor of Density of the Schistosome Intermediate Host, Bulinus nyassanus (Gastropoda: Planorbidae), in Lake Malaŵi

Arrested development of the myxozoan parasite, Myxobolus cerebralis, in certain populations of mitochondrial 16S lineage III Tubifex tubifex

The effect of cohabitation of Tubifex tubifex (Oligochaeta: Tubificidae) populations on infections to Myxobolus cerebralis (Myxozoa: Myxobolidae)

Contact Info

Product

Resources

About