Ecology, Environment and Conservation Paper

QUANTITATIVE VARIATIONS IN THE HYDROLYZING ENZYMES OF OREOCHROMIS MOSSARN' ICUS (PETERS) EXPOSED TO LANNATE (METHOMYI)- A EARBAMATE PESTICIDE

J.J. Arockia Rita and M.C. John Milton

Abstract

The activity of LDH and SDH remained unchanged in control brain, gill, kidney, liver and muscle. While in tissues of the treated fishes there was a tremendous decline in the activity of LDH and SDH. The brain showed moderate decline in LDH activity after 15 days of exposure and later in 30 and 45 days of exposure the trend was for higher values. In gill an increase was observed at 15 days and followed by a declining trend after 30 and 45 days of exposure. The tissues like Kidney, Liver and Muscle showed marginal increase in LDH and SHD activity after the first 15 days exposure but the decline in the values were very high after 30 and 45 days of pesticidal exposure. The effect of pesticide Methomyl was almost uniform on all selected target organs of the fish Oreochronlis mossanthicus. The 45 days of sublethal concentration exposure produced more toxic effect of LDH and SDH than others.