Laboratory experiments were carried out to spot light on the effect of some plant extract
treatments on levels of total protein, carbohydrates, lipids and glucose, as well as on the activity of
peroxide, catalase and alkaline phosphatase (ALP) enzymes in E. vermiculata snail. Results revealed that
the least level of total protein was recorded among animals treated with 10% Nerium oleander plant extract
(6.30mg/ml), while level of carbohydrate was the least by Eucalyptus melliodora plant extract treatment at
10% concentration (1.41 mg/ ml). On the other hand, the highest reduction of total lipids and glucose
levels were recorded after treatment by Azadirachta indica plant extract at 10% concentration. The present
data showed also the highest activity of peroxidase and catalase enzymes after Eucalyptus melliodora plant
extract 20% treatment and the least activity for the same two enzymes occurred by Nerium oleander
treatment. In addition, the highest reduction of (ALP) activity was registered after treatments by extracts of
Nerium oleander and Azadirachta indica extracts.