Lawee, A. Y.Kigbu, A. A.Agyo, K.2023-12-112023-12-112016-03-03Auta, J. (2001) Toxicity of Dimenthoate to javeniles of Oreochromis niloticus (Trewavas). Journal of Aquatic Science 6, 150-158. APHA (1985). American Public Health Association Standard Methods for the Examination of Wastewater. 15th Ed. American Public Health Association, Washington D.C. 1193 p. American Society of Testing Materials (ASTM) (1977) Standard Practice for conducting Basic Acute Toxicity Tests with Fishes. Macro Invertebrate and Amphibian. pp. 51-56. Clarkson, D. T., Hopper, M. J. and Jones, L. H. P. (1986). The effect of root temperature on the uptake of nitrogen and the relative size of the root system in Lolium perenne. I. Solutions containing both NH4 and NO3. Plant, Cell and Environment, 9:535-545. Chouhan M. S. and Pandey, A. K. (1987). On the tolerance limits and toxicity symptoms of guppy (Lenbistes reticulates) to urea and ammonium sulphate. Comparative Physiology and Ecology, 12:7-80. David, M. and Philip, G. H. (2005). Accumulation of fenvalerate and induced alteration in Lactate and Succinate dehydrogenase activity in Labeo rohita. J. Ecophysiol Occup. Hlth., 5(3,4): 207-211. Gangbazo, G., Pesant, A. R., Barnett, G. M., Charuest, J. P. and Cluis, C. C. (1995). Water contamination by ammonium nitrogen following the spreading of hog manure and mineral fertilizers. Journal of Environmental Quality, 24:420-425.https://keffi.nsuk.edu.ng/handle/20.500.14448/3099The study on the acute toxicity and behavioural changes of inorganic (N.P.K 15:15:15) fertilizer on the juveniles of Clarias gariepinus with mean weight 54.3g with corresponding mean total length of 23.13cm and mean standard length of 14.41cm respectively were investigated using static bioassay over a period of 96hours interval. The observed behaviours of the fish were restlessness, loss of balance and period of quiescence and finally death. However, the intensity of these reactions and mucus secretion were more in tanks containing 1.84 and 1.92 gl-1 concentrations of the toxicants. Statistical analysis showed no-significant difference in the mean differences of operculum and tail fin movement. The 96 hours LC50 of the exposed fish was also determined to be 1.74 gl-1. This was observed to be dose-dependent. N.P.K 15:15:15 fertilizer has toxic potential and profound impact on behaviour on Clarias gariepinus juveniles.enFertilizer, (15:15:15), Acute toxicity, Clarias gariepinus.Article