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In this study, adult snails, Helix aspersa were used to estimate the effect of aneonicotinoid insecticide (thiametoxam) on biochemical parameters and histological changes in the hepatopancreas of this gastropod after a treatment of six weeks. During this period, snails were exposed by ingestion and contact to fresh lettuce leaves which were soaked with an insecticide solution. The thiametoxam test solutions were 0, 25, 50, 100 and 200 mg/L. The results of the biochemical dosages (total carbohydrates, total proteins and total lipids) showed significant decreases at two concentrations (100 and 200 mg/L) of thiametoxam. However, the histological examination of the hepatopancreas of the treated snails showed alterations as a response to all the treatments, and revealed the degeneration of the digestive tubules and the breakdown of the basement membrane in a dose-dependent manner, leading to a severe deterioration of the tissues in the concentration of 200 mg/L thiametoxam. The dosage of carbohydrates, lipids and proteins supported by the study of histological changes on the hepatopancreas of H. aspersa can be considered as potential biomarkers of exposure to thiametoxam.       Key words: Insecticide, Helix aspersa, thiametoxam, hepatopancreas, biochemical study, histological study

african journal of biotechnology

Histological changes and biochemical parameters in the hepatopancreas of terrestrial gastropod Helix aspersa as biomarkers of neonicotinoid insecticide exposure