eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-05-06 8 2 669 675 9495 article Praveen Kumar Rai 1 Arun K. Srivastava 1 Fish Physiology and Toxicology Laboratory, Department of Zoology, S.M.M.T.D. College Ballia - 277 00 (India). The aim of the present work to study the comparative effects of a carbaryl (carbamate) and 2,4-D sodium salt (Herbicide) on haematological parameters of a freshwater catfish, H.fossilis, at different concentrations and time intervals. The catfish shows significance differences in their haematological parameters like RBC, WBC, Hb g%, haematocrit and clotting time at acute and subacute concentration for acute (96h) and short (10-20 days) time intervals but no remarkable changes were observed in sublethal concentration at long (30-60 days) term to both the toxicant. It is also observed that carbaryl is more toxic to fish then 2,4-D sodium salt. https://www.biotech-asia.org/vol8no2/comparative-toxicological-studies-of-a-carbamate-carbaryl-and-herbicide-24-d-sodium-salt-on-haematological-parameters-on-a-freshwater-catfish-heteropneustes-fossilis-bloch/ Carbaryl 2 4-D sodium salt; Haematological parameters; Heteropneustes fossilis