Determination Of Median Tolerance Limit Of Colisa Fasciatus For Azodyes Metanil Yellow And Bismark Brown

Abstract

The present study is to evaluate the LC50 value of a fresh water fish Colisa fasciatus  when exposed to azodyes Metanil yellow( 4†Aniline azobenzene –m – sulfonic acid) and Bismark brown ( 2,4, - diamino 3†aminoazobenzene). In case of metanil yellow the LC50 value at 96 hrs. Exposure was calculated to be 1.8751 Log mg / l. In case of bismark browm the LC50 value at 96 hrs exposure was calculated to be 1.9031 Log mg / l.