In their general distribution, freshwater pulmonate snails
are benthic animals living in the shallower water of lakes,
ponds, marshes, rivers, streams and ditches [7,8]. Snail control
strategies are considered a priority for the reduction of
transmission. Synthetic molluscicides (niclosamide) have been
widely used for chemical control [9]; although chemical
control only gives a temporary reduction in snail density. The
biological methods, especially those involving the use of
indigenous predators, were traditionally perceived as
environmentally friendly and have been the foci of research
and management of this pest [10]. Predators in nature often
include an array of prey types in their diet. Furthermore, in
the presence of multiple prey types, they often select certain
prey types over others [11]. Predation is a major force affecting
species abundance, population dynamics and community
structure [12]. Dragonflies are ideal predators of many insect
pests and have an important role in biological pests control in
various ecosystems. Dragonflies have proved to be potential
bio-control agents of mosquitoes and are considered an important
predators of various macro-invertebrates [13,14