TOXICITY OF THE PYRETHROID INSECTICIDE FENVALERATE TO A FRESH-WATER FISH, TILAPIA-MOSSAMBICA (PETERS) - CHANGES IN GLYCOGEN-METABOLISM OF MUSCLE

Toxic effects of a pyrethroid insecticide, fenvalerate, on fish muscle glycogen metabolism were investigated. Estimations were made after 10 and 20 days of exposure, and altered muscle glycogen metabolism was observed. The changes included a significant (P < 0.001) decrease in the levels of glycogen, pyruvate, maleate dehydrogenase (MDH), succinate dehydrogenase (SDH), and phosphorylase a, b, and ab activities, while elevated levels of lactic acid, aldolase, and lactate dehydrogenase (LDH) activity were observed under fenvalerate intoxication. There was a decrease in opercular movement and oxygen consumption with an increase in concentration of fenvalerate. © 1990.