Author(s): Shivaraj Y, Asiya Nuzhat FB and Rajesh R

Abstract: The aquatic environment is subjected to heavy and diverse pollutants load, particularly in the highly industrialized and urbanized regions. There is much concern over possible effects of these pollutants on aquatic life. This sewage water was procured from the local area, nearby Ammanikere pond, Tumakuru, Karnataka, India. Short term definitive test by static renewal bioassay method was conducted to determine the acute toxicity (LC₅₀) of sewage water and freshwater fish fingerlings were exposed to different concentrations of sewage water 15ml/L for 96hrs, 30ml/L for 96hrs, 60ml/L for 96hrs and 120ml/L for 96hrs were selected for acute study on fish, Cyprinus carpio procured from Fisheries Research and Information Centre (Inland) Hebbal, Bangalore, Karnataka, India. The size of the fish will be (3 ± 0.21 g; 3 ± 0.25 cm) and duration of the study will be 1, 5, 10 & 15 days respectively. The present study shows that behaviour condition of the fishes were varies and symptoms dictated like irregular, erratic and darting swimming movements, hyper excitability, capsizing, attaching to the surface, restlessness, difficulty in breathing, loss of equilibrium and gathering around the ventilation filter and the bodyweight of the fishes also decreases slowly up to 15 days of time period. This present investigation shows that impact of sewage water on the changes in behaviour and bodyweight of a freshwater fish, Cyprinus carpio. For this study the treatment of toxic effects of sewage water on the desired fish species that is Cyprinus carpio was found suitable for the exposure based on the available literature survey. The results of the study evidenced that sewage is toxic and thus, it has led to the altered fish physiology. However the exact mechanism through which this is achieved needs to be studied further.

Pages: 198-205  |  853 Views  132 Downloads

Download Full Article: Click Here