Effects of Detergents on Nile Tilapia (Tilapia nilotica Linn.)

Abstract

Static bioassay was used to determine the acute toxicity of three synthetic detergents on nile tilapia (Tilapia nilotica). The 96-hour LC50 with 95 percent confidence intervals of Fab (hard detergent), White magic and Fab (soft detergent) were estimated at 19.5 (18.66 - 20.37), 12.6 (12.04 - 18.18) and 9.2 (8.81 - 9.61) pprn respectively. There were no significant differences in growth during 12 weeks period between the controls and fish exposed to Fab (soft detergent) at concentrations 0.5 and 3.0 pprn but growth of the fish exposed to Fab at 7.0 pprn was significantly lower than the control, 0.5 and 3.0 pprn groups. No histological changes were observed in gills, liver, kidney, intestine and muscle of fish exposed to Fab (soft detergent) at the concentrations of 0.5, 3.0 and 7.0 pprn for 12 weeks.