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Impact of short-term exposure of sub lethal concen tration of organophosphate pesticides Ekalux on physiology of sub adults of Anabas testudineus in the Kol paddy fields of Central Kerala was studied. Results of the present study indicated tha t even short-term, exposure to Ekalux is detrimenta l to A. testudineus . Among the parameters that showed significant chan ges were heamatological parameters such as Hb, PCV, RBC count, and ESR. Cell morpholog y shifted from a normal elliptical shape after 24 hr to crenated or fringed and shrinked appearance a t 15 day of exposure. It was also seen that protein and amino acid concentration are clear indicators o f immediate stress. Histopathological studies of li ver showed hypertrophied hepatocytes with reduced numbe r of normal cells after 15 days of exposure. The number of haematopoietic tissue was found to have d eclined in the kidney also in addition to increased number of melano-macrophage centres (MMC). However, once these fishes were reared in clear water, devoid of any pesticide for six months, values for Hb, PCV, protein, amino acid and liver and renal tissues showed signs of revival. The present study depicts that severity of Ekalux toxicity to sub adu lts of Anabas testudineus i both dose and time dependant.

EFFECT OF EKALUX TOXICITY ON SELECTED PHYSIOLOGICAL PARAMETERS IN ANABAS TESTUDINEUS