Evaluation of pesticide residues in fish tissue samples collected from different markets of Jorhat district of Assam, India

Five sample of each fish in each location per month was collected from three markets of Jorhat districts for three months. Three markets are Jorhat fish market, Lichubari fish market and Teok fish market of Jorhat district. The fish species are Puthi(Puntius sophore),Muwa (Amblypharyngodon mola) Indian major carp (Cirrhinus mrigala), Catla(Catla catla), Rohu(Labeo rohita), Kuhi(Labeo goniuf), Common Carp(Cyprinus carpio), Calbasu (Labeo calbasu). The samples were homogenized and grind with the help of an electrical grinder. The samples were analyzed by multi residues method using GC-ECD. The residues of various pesticides in fish tissues were investigated and the main group of contaminant was the OCs followed by SPs. The contamination by OC group viz., α-HCH ranged from 0.001 to 0.0019 µg g -1 , β-HCH ranged from 0.001 to 0.0016 µg g -1 , δ-HCH ranged from 0.0012 to 0.0053 µg g -1 , alachlor ranged from 0.001 2 to 0.0013 µg g -1 , aldrin ranged from 0.001 to 0.0015 µg g -1 , endosulfan-I ranged from 0.001 2 to 0.0015 µg g -1 , butachlor ranged from 0.0012 to 0.0014 µg g -1 , P,P'-DDE ranged from 0.001 to 0.0014 µg g -1 , endosulfan-II ranged from 0.0012 to 0.0013 µg g -1 , P,P'-DDD ranged from 0.001-0.0014µg g -1 and P,P'-DDT ranged from 0.0012- 0.0014µg g -1 . The contamination by SP group viz. fenpropathrin ranged from 0.001 to 0.0012µg g -1 , permethrin-I ranged from 0.001 to 0.0012µg g -1 ,λ-cyhalothrin ranged from 0.001 to 0.002µg g -1 , α-cypermethrin ranged from 0.001 to 0.0021µg g -1 and deltamethrin ranged from 0.001 to 0.0013µg g -1 . Among the OC compound the major contaminants were α-HCH followed by β-HCH, δ-HCH, P,P'-DDT and P,P'-DDE