author(s)
Sheethal K. U, Telugu Chandra Mohan, Gangadhara Gowda, Harsha Nayak and Sruthisree

abstract
Since ten years fresh water bodies influencing by different contaminants, among all heavy metals are considered as the most important pollutant. Nickel metal is used in as a raw material various industries. As it toxic and alter the physiological and haematological parameters of fish. In the present study, acute toxicity test was used for determination lethal toxicity of Nickel Chloride in the fingerlings of Nile tilapia, Oreochromis niloticus as the test organism. Toxicity test is most reliable for accessing effect of toxicants on aquatic life. The Static bioassay test was conducted to estimate acute toxicity of Nickel to the fresh water fingerlings of Nile tilapia Oreochromis niloticus. Fish were exposed to selected concentration of Nickel and the mortality data were determined after 96 hours with 6 hrs interval of mortality observation.