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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.
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