To determine the LC50 of Deltamethrin during exposure of Cyprinus carpio. To assess the alterations in Carbohydrate metabolism during different concentration of Deltamethrin toxic condition in different organs of fish. To evaluate the alterations in Protein and Amino acid metabolism during Deltamethrin toxic state in fish. To determine the cholinergic metabolism during Deltamethrin toxic conditions of fish. To resolve the Antioxidants and detoxifying enzyme systems in Deltamethrin toxic setting of fish. To find out the Lipid profiles and Lipid peroxidation in Deltamethrin toxic conditions of fish. Though the present study is preliminary in its outlook, yet the attempts that are made in the present investigation will certainly pave the way for commendable research in this direction. The author remains pardonable for any errors which may have crept in due to oversight, and for any investigative lacunae which are due to limitations in facilities. The author welcomes constructive comments from the reviewers on this research work and suggestions for future studies.