author(s)
Reetu Bhanot and Swarndeep Singh Hundal

abstract
The present study was designed to evaluate the acute toxic effects of different concentrations of untreated sewage water on survival and growth rate of Labeo rohita fingerlings. The fingerlings (7.62±0.25 cm in length, 8.25±0.32 g in weight) were procured from Guru Angad Dev Veterinary and Animal Sciences University (GADVASU) Ludhiana, Punjab, India. Acute toxicity test was conducted for 96 hrs to determine LC₅₀ of the untreated sewage water using five concentrations viz. 10%, 25%, 50%, 75% and 100%. Results of the study depict that the fingerlings exposed to 100% concentration of untreated sewage water showed 100% mortality rate in less than 24 hrs. The fingerlings exposed to 10%, 25% and 50% concentration of UT also showed significant decrease (p<0.05) in growth rate for the period of 96 hrs. Hence, the study concluded that the untreated sewage water can induce acute toxic effects in Labeo rohita which necessitates the treatment of wastewater before its discharge into water bodies.