Effects of Quinalphos 25 EC and Dimethoate 30 EC  on Activities of AchE, Catalase, GOT and GPT in the  Freshwater Prawn Macrobrachium rosenbergii

Saravana Bhavan P; Ananthi P; Satgurunathan T; Sowdeswari R; Muralisankar T; Ponmathi K

Volume : III, Issue : VIII, August - 2013

Effects of Quinalphos 25 EC and Dimethoate 30 EC on Activities of AchE, Catalase, GOT and GPT in the Freshwater Prawn Macrobrachium rosenbergii

Saravana Bhavan P, Ananthi P, Satgurunathan T, Sowdeswari R, Muralisankar T, Ponmathi K

Abstract :

The commercially important freshwater prawn, Macroachium rosenbergii post larvae (PL), 1.5±0.2 cm and 0.1±0.03 g were subjected to static renewal type acute toxicity bioassays against two orgnophophate insecticides, quinalphos (Ekalux EC 25) and dimethoate 30% EC (TAFGOR). The 96 hr LC50 values were determined to be 0.774 µgl–1for quinalphos and 0.856 mgl–1for dimethoate. The PL were exposed to lethal (the 96 hr LC50) and sub–lethal (1/2nd and 1/4th of the 96 hr LC50) concentrations of these insecticides (quinalphos: 0.774, 0.384 and 0.193 µgl–1; dimethoate: 0.856, 0.428, 0.214 mgl–1) for a duration of 4, 8 and 12 days to study their acute and chronic impacts on whole body activities of enzymes, the neurotransmitter, acetyl cholinesterase (AChE), the antioxidant, catalase and metabolic enzymes, glutamate oxaloacetate transaminase (GOT) and glutamate pyruvate transaminase (GPT). The activity levels of AChE and catalase were found to be significantly (P<0.05) decreased in test prawns when compared with control, whereas, there were significant elevations in GOT and GPT levels (P<0.05). Among GOT and GPT, the impact was more on GOT than GPT. The dosage and time dependent manner of inhibition or elevation in activities of these enzymes were recorded. Among these two insecticides, quinalphos showed more impacts than dimethoate on this non–target organism.