Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Contamination of fresh water Schizothoracine fishes with chlorpyrifos from eutrophic Dal Lake basins, India
Irfan Ahmad Khan

Last modified: 2015-09-15

Abstract


Intensive farming practiced in the surrounding area of Dal Lake and its floating gardens leads to an enhanced vulnerability of crops to pests and indiscriminate use of pesticides. Possible transfer of these hazardous molecules from vegetable fields to the aquatic environment of the Lake, poses a potential threat to the aquatic species and human health as well. The myriad ways in which people use the lake along with the numerous pollutant-generating activities have stressed the lake ecosystem in diverse ways. In the present investigation conducted from 2008 to 2010, 135 samples of fish including 81 samples of  Schizothorax niger, Schizothorax esocinus  ( Algaad / Churuu Gaad) and 54 samples of Cyprinus carpio Spp (var: communis & specularis {Punjab Gaad}) were collected from three basins of Dal . The samples were analyzed for seven commonly used pesticides viz. Butachlor, yHCH, Chlorpyrifos, Hexaconazole, Endosulfan 1, Endosulfan 2 and Dichlorvas with GC-MS/MS. It was found that 73 samples (54.07%) out of 135 were contaminated with chlorpyrifos an organophosphate pesticide with mean concentration of (0.0009 ± 0.0010ng/kg) with concentration ranging from undetected to 0.003ng/kg. Level of pesticide was higher in pesticide use season than non use season except in 2009 when levels were same.Presence of sub acute exposure of chlorpyrifos in a locally consumed Schizothorax niger, Schizothorax esocinus species and not in Cyprinus carpio spp. The low dose exposure to pesticides through food chain like fish can be a major contributor for presence of pesticide residual levels in human blood.