Biomphalaria alexandrina

About: Biomphalaria alexandrina is a research topic. Over the lifetime, 413 publications have been published within this topic receiving 3781 citations.

The molluscicidal properties of some Bayluscide homologues.

Abstract: The molluscicidal properties of 5-nitro- and 3-nitro2',4'-dichloro salicylanilides and their mixture 5.5 : 1 were investigated against the intermediate hosts of schistosomes Bulinus truncatus and Biomphalaria alexandrina. Unlike Bayluscide, the activity of the new mulluscicides is not affected by strong sun radiation or by acidic pH. Their activity is resistant to storage, river-bed mud and lower temperature.

Field tests on two new molluscicides (Molucid and WL 8008) in the Egypt-49 project area.

Abstract: In a continuing search for more effective molluscicides, tests were carried out in the Egypt-49 area on Molucid and WL 8008. Molucid, a 35% w/v solution of isobutyltriphenyl-methylamine (ICI 24223), was applied at 2 ppm for 6 hours; after the treatment, no live Bulinus truncatus, Biomphalaria alexandrina or Lymnaea caillaudi were observed for at least three months and snail densities remained low for at least seven months. Egg-masses were not affected by the treatment, however. WL 8008, N-tritylmorpholine, was applied as a 10% w/v emulsifiable concentrate in carbon tetrachloride (formulation 1), as a 20% w/v emulsifiable concentrate in tetrachlorethylene (formulation 2) or as bait. The two liquid formulations, applied at 0.25 ppm for 6 hours, gave a high initial kill, but snail densities regained their original levels within two months for Bulinus and within four months for Biomphalaria. The bait, applied at 62 lb-150 lb (28 kg-68 kg) per feddan, was ineffective. Like Molucid, WL 8008 is non-ovicidal.

Miracidiophagic and cercariophagic activity of the fish gambvsia affinis and oreochromis niloticus and their effect on the infection of biomphalaria alexandrjna by schistosoma mansoni miracidia

Abstract: Miracidiophagic and cercariophagic activity of two fish species namely Gambusia affinis and Oreochromis niloticus and their possible role in controlling the infection of Biomphalaria alexandrina with Schistosoma mansoni mracidia were studied. The results showed that the infection rates of B. alexandrina exposed for about 3000 miracidia in presence of each fish species were significantly lower than the controls. There was an inverse relation between the number of O. niloticus and the infection rate of B. alexandrina. Conversily, in case of G. affinis, the rate of infection of B, alexandrina was increased by increasing the number of fish added to the same volume of water. The miracidiophagic activity of O. niloticus indicated that the average percentage of miracidia consumed by fish after 60 minutes exposure were 71.05 % and 78.2 % when fish were exposed to approximately 1500 and 3000 miracidia respectively. The cercariophagic activity of G. affinis and O. mlojicits showed that the reduction in the number of cercariae offered to each fish species were significantly higher than the controls. The consumption of cercariae by each fish species was greatly influenced by cercariae concentration; the higher the concentration, the more cercariae consumed by the fish.