Helisoma duryi as a biocontrol agent under laboratory conditions: II-effect of h duryi on the cercarial production of schistosoma mansoni infected biomphalaria alexandrina snails

ABSTRACT

The effect of H. duryi on the cercarial production of Schistosoma mansoni infected B. alexandrina snails was studied. The obtained results revealed that the death rate of the infected snails was increased as the number of H. duryi increased. The average cercarial production per snail was decreased as the number of H. Duryi increased. On the other hand, the infection rate and the snail cercarial production per 100 exposed B. alexandrina snails were increased as the number of H. duryi decreased and was greatest at proportion 102