Bulinus truncatus

About: Bulinus truncatus is a research topic. Over the lifetime, 414 publications have been published within this topic receiving 5640 citations.

Toxicity of commiphora molmol (myrrh) water suspension to some non-target aquatic organisms and its molluscicidal and biological activities on bulinus truncatus and biomphalaria alexandrina (mollusca, gastropoda) -

Abstract: The molluscicidal activity of Commiphora molmol (myrrh) water suspension showed that Bulinus truncatus snails were found to be about 3 times more susceptible than Biomphalaria alexandrina snails. The 24-hour LC50 values recorded were 46.4 and 145.8 ppm, respectively. There was a significant negative correlation between LC values and exposure periods. The present study is yet the first attempt to investigate the toxicity of C. molmol aquous suspension (in vitro) against non-target aquatic organisms coexisting with vector snails in their habitat. The obtained results revealed that the plant water suspension was more toxic at the molluscicidal levels to the crustaceans Daphnia sp, Cypris sp, Cyclops sp. , Cardina nilotica and the fish Gambuzia affinis at a concentration of 50 ppm (in average) after 48 hr of exposure. Culex larvae were more tolerant to the plant suspension than other organisms. Chronic effects of sublethal concentrations of C. molmol water suspension on some biological parameters of B. truncatus snails showed a significant decrease in food consumption and egg production of snails. At the sublethal concentration of LC50, no hatching was observed after 17 days of exposure. After 24 hour of exposure to C. molmol water suspension 70% mortality of newly hatched snails (3-days old) was observed at 50 ppm. In addition, biochemical investigation showed significant differences as compared to the control regarding the total protein content, and the activity of transaminases (AST, ALT) and Lactate dehydrogenase (LD) except a mild decrease in glycogen concentration and alkaline phosphatase activity in digestive gland tissue of snails. Ultrastuctural investigation of exposed snails to C. molmol water suspension showed some alterations in the digestive gland of snails (i.e. marked vaculation, increased lysosomal activity, swollen mitochondria and consumption of stored lipid and glycogen). Based on the toxicity of C. molmol to the aquatic ecosystem at the examined sublethal levels, it is not recommended as a herbal molluscicide.

Discriminant analysis of free fatty acids of some Egyptian snails as a step for schistosomiasis control: new trends.

Abstract: Schistosomiasis is still the most common occupational health problem of rural workers in Egypt. The use of molluscicides, either chemical or biological, and environmental changing are the most successful methods of snail control. The new trend in Schistosoma control programs is to study the ecological factors that attract miracidium Schistosoma specific snails, to emphasizing to find out new environmental safe control methods. Since Schistosoma worms do not make fatty acids de novo, they require host lipids for survival and to complete their life cycle. Discriminate analysis of the estimated free fatty acids was done in this study in Biomphalaria alexandrina, Biomphalaria glabrata, and Bulinus truncatus, viz. Lymnaea truncatula and Physa acuta (Schistosoma intermediate and non-intermediate respectively). With the objective of determination of the biochemical difference that attract the infestation of Schistosoma miracidium to the target snails, as a step of the new control trends. Caprylic acid (C8:0), and Oleic acid (C18:1) are significantly lower in the tissues of Schistosoma intermediate snails compared to the non-intermediate snails. While, Capric acid (C10:0), Margaric acid (C17:0), and Lenoleic acid (C18:2) of the intermediate snails are significantly higher than that of non-intermediate snails. The percent of correct medical classification of snails are more than 80% according to Caprylic acid, Margaric acid, and Lenoleic acid, the other 15 fatty acids are less than 80%. These three free fatty acids could be chemoattractive of Schistosoma miracidium, and could be used as safe environmental control compounds, which needs further research.

Laboratory evaluation of Limnatis nilotica leech (Annelida: Hirudinea) as a biocontrol agent for the schistosome-vector snail, Bulinus truncatus

Abstract: Objective: To investigate the predation efficacy of the freshwater leech, Limnatis nilotica (L. nilotica) as a potential biological control agent against different stages of the Bulinus truncatus (B. truncatus), the intermediate host of human Schistosoma haematobium, under laboratory conditions. Methods: The leech L. nilotica and the snail B. truncatus were collected from El Kiryab Agriculture Scheme, Sudan. Thereafter, the predatory activity of the leech was evaluated against eggs, neonates and adults of the snail in a series of different experiments under laboratory conditions. Results: The findings showed that the L. nilotica leech was a voracious predator towards the eggs and neonates of B. truncatus snails with a shell length of up to 3 mm, as well as of adult snails with an shell length greater than 3 mm. Conclusions: The results showed that L. nilotica had a significant impact on B. truncatus populations. However, long term studies under natural field conditions are needed to support these results.

Miracidia of an Egyptian Strain of Schistosoma mansoni Differentiate Between Sympatric

Abstract: The host-finding behavior of miracidia of 2 strains of Schis- ica and showed no or a weak response to SCW from the other sympatric tosoma mansoni from Egypt and Brazil was studied by recording their species, whereas miracidia of the Brazilian strain did not differentiate responses to snail-conditioned water (SCW) from the Egyptian sym- between SCW from different snail species. patric snails, Biomphalaria alexandrina, Physa acuta, Lymnaea cailliu- di, and Bulinus truncatus, as well as from Biomphalaria arabica and Gastropod molluscs serve as obligate intermediate hosts in most Biomphalaria glabrata. Miracidia of the Egyptian strain significantly trematode life cycles. The importance of snail hosts for trematode trans- preferred SCW from their compatible hosts B. alexandrina and B. arab- mission has stimulated extensive work on the compatibility between ABSTRACT: The host-finding behavior of miracidia of 2 strains of Schis- ica and showed no or a weak response to SCW from the other sympatric tosoma mansoni from Egypt and Brazil was studied by recording their species, whereas miracidia of the Brazilian strain did not differentiate responses to snail-conditioned water (SCW) from the Egyptian sym- between SCW from different snail species. patric snails, Biomphalaria alexandrina, Physa acuta, Lymnaea cailliu- di, and Bulinus truncatus, as well as from Biomphalaria arabica and Gastropod molluscs serve as obligate intermediate hosts in most Biomphalaria glabrata. Miracidia of the Egyptian strain significantly trematode life cycles. The importance of snail hosts for trematode trans- preferred SCW from their compatible hosts B. alexandrina and B. arab- mission has stimulated extensive work on the compatibility between

The Breeding of Bulinus truncatus in Total Darkness

Abstract: Starting with eggs from a natural habitat the authors were able to raise and breed Bulinus truncatus, the snail vector of schistosomiasis haematobia, under conditions of total and continuous darkness and to complete the life-cycle from egg to egg in 70 days. The rearing of a second generation was interrupted by circumstances beyond the authors’ control. Darkness is shown nevertheless to have a restrictive effect on population growth and the use of covered channels and pipes for irrigation water, although not a complete control measure, should therefore be adopted wherever possible in endemic foci of schistosomiasis haematobia where snail control is necessary.