Abstract

The present study was investigated the biochemical effect of two molluscicides baits Methomyl and Diazinon on the tissues of the land snail, Theba pisana . The activities of three vital enzymes, total protein (TP) and total lipid (TL) were laboratory tested. The enzymes were aspartate amino transaminase (AST) ; alanine amino transaminase (ALT), and Alkaline phosphatase (ALK). Results showed that all tested molluscicides lead to increase the activity of AST, ALT and ALK in the tested land snail, Theba pisana, except Diazinon 1% treatment showed a decrease in AST and ALK when applied against the land snail. On the other hand, the level of total protein was increased after treatment with Methomyl 5% and 3% and Diazinon 5% and 3% , while decreased after treatment with Methomyl 1% and Diazinon 1%. The level of total lipid was increased with Methomyl 5%, 3%, 1% and Diazinon 5%, 3%but decreased with Diazinon 1%. In general, two molluscicides were significantly affected on the activities of enzymes, total lipid and total protein compared with control treatment when applied against the tested snails.