International Journal of Fisheries and Aquatic Studies
2018, Vol. 6, Issue 6, Part D
Impact of deltamethrin toxicity on the changes in behavioural aspects of a freshwater fish, Cirrhinus mrigala Author(s):
Dr. Vidya R Naik and Dr. M DavidAbstract:
The aquatic environment is subjected to heavy and diverse pollutants load, particularly in the highly industrialized and urbanized regions throughout the globe. There is much concern over possible effects of these Deltamethrin is a synthetic pyrethroid insecticide widely used throughout the world to control different crop pests, flies, and mosquitoes etc., which effects directly or indirectly to this aquatic life. This commercial grade deltamethrin (Decis, 30%EC) was obtained from Bayer Crop Science, India Ltd., Gujarat, India. Short term definitive test by static renewal bioassay method was conducted to determine the acute toxicity (LC50
) of deltamethrin and freshwater fish fingerlings were exposed to different concentrations of deltamethrin ranging from 3 ul/L to 9 ul/L. LC50
96 h (8 ul/L) of deltamethrin and one tenth of the 96 h LC50
(0.8 ul/L) was taken as the sub-lethal concentration to this behavioural toxicity study, and the fish, Cirrhinus mrigala
weighing 5 ± 2 g were collected from the local fish farm Dharwad, Karnataka and were stored in large aquaria and providing good laboratory environmental conditions throughout the experimental period and these fishes were fed daily with commercial available fish pallets which had around 40% protein content. They were acclimatized to laboratory conditions for fifteen days. The aquarium was cleaned periodically to avoid infection to fish and 1% potassium permanganate solution was sprayed to eradicate any bacterial or fungal infection. The temperature of water in the aquaria was 29 ± 2 °C and the same was maintained throughout the course of investigation. And duration of the study was 1, 2, 3 and 4 days for lethal concentration and 1, 5, 10 and 15 days for sub-lethal concentration were chosen to observe the short-term and long-term effects of deltamethrin on the fish, Cirrhinus mrigala.
The present study shows that behaviour condition of the fishes varied and symptoms were identified like irregular, erratic and darting swimming movements, hyper excitability, capsizing/overturning, attaching to the surface, restlessness, difficulty in breathing, loss of equilibrium and gathering around the ventilation filter up to 15 days of time period. The treatment of toxic effects of Deltamethrin on the desired fish species that is Cirrhinus mrigala
was found suitable for the exposure based on the available literature survey. This present investigation shows that impact of Deltamethrin on the changes in behavioural aspects of a freshwater fish, Cirrhinus mrigala
for this study. The results of the study evidenced that Deltamethrin 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: 273-277 | 353 Views 19 DownloadsDownload Full Article:
How to cite this article:
Dr. Vidya R Naik, Dr. M David. Impact of deltamethrin toxicity on the changes in behavioural aspects of a freshwater fish, Cirrhinus mrigala . Int J Fish Aquat Stud 2018;6(6):273-277.