Melanoides tuberculata check for this species in other resources - Biomphalaria glabrata check for this species in other resources - schistosomiasis"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 5, 2002, pp. 743-745
Bioline Code: oc02141
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 5, 2002, pp. 743-745

 en The Molluscicidal Activity of Niclosamide (Bayluscide WP70®) on Melanoides tuberculata check for this species in other resources (Thiaridae), a Snail Associated with Habitats of Biomphalaria glabrata check for this species in other resources (Planorbidae)
Alexandre Giovanelli; Cesar Luiz Pinto Ayres Coelho da Silva/+; Luisa Medeiros* & Maurício Carvalho de Vasconcellos

Abstract

The aim of this study was to determine the toxicity of niclosamide (Bayluscide ®) on Melanoides tuberculata check for this species in other resources and Biomphalaria glabrata check for this species in other resources under laboratory conditions. The latter species is the intermediate host of Schistosoma mansoni check for this species in other resources (Sambon 1917). M. tuberculata was successfully used as competitor of B. glabrata in biological control programs in French West Indies. Both molluscicide and biological control using M. tuberculata have proved to be successful in reducing the population density of B. glabrata . The associated use of molluscicide in this area would be an effective measure if M. tuberculata were less susceptibility to the molluscicide than B. glabrata . Three hundreds individuals each of B. glabrata and of M. tuberculata , collected in Sumidouro, State of Rio de Janeiro, were used in the experiment. The molluscs were exposed to 14 different concentrations of niclosamide as recommended by the World Health Organization. Probit analysis was used to determine the LC 50 and LC 90. The LC 50 and LC 90 values for B. glabrata were 0.077 mg/l and 0.175 mg/l, respectively and the LC 50 and LC 90 values for M. tuberculata were 0.082 mg/l and 0.221 mg/l respectively. As the lethal concentrations of niclosamide were approximately the same to both species, this could be a disadvantage when controlling B. glabrata with niclosamide in an area of M. tuberculata occurrence. It migth therefore be preferable to utilize the latex extracted from the Euphorbia splendens, which presented a much higher efficiency for B. glabrata than to M. tuberculata .

Keywords
molluscicide - niclosamide - Melanoides tuberculata check for this species in other resources - Biomphalaria glabrata check for this species in other resources - schistosomiasis

 
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