Experimental evaluation of Odonata nymph in the biocontrol of schistosomiasis intermediate hosts

摘要: Abstract Objective To evaluate the predatory potential of Odonata nymph on freshwater snails that serve as intermediate hosts for Schistosoma species ( Bulinus truncatus and Biomphalaria alexandrina ). Methods Observations searching, attacking devouring two snail types with series laboratory-based predation experiments, whose aims were to determine daily rate, differential predation, prey preference considering small-, medium- large-sized conducted. Results Laboratory evaluation revealed that, could kill consume hosts. The number consumed differed according type, size density. times taken searching handling dependent size, type satiation predator. rate varied also respect This study evaluated nymphs more than per unit time, there may be a smaller larger snails. Conclusions According our observation, predator, Hemianax ephippiger suitable biocontrol agent in connection