Author:
Das B. K.,Mukherjee S. C.
Abstract
Fingerlings of rohu, Labeo rohita weighing 8.52±2.54 g and a mean body length of 6.11±2.52 cm were used for acute and chronic toxicity tests. The LC50 value was determined as 124.59 mg/l at 96 hours. Clinical signs and symptoms of the test organisms were recorded. Behavioural changes included vigorous caudal fin movement, hyperexcitability and spiral movement with head downward. The moribund fish floated upside down at the surface, often sinking passively to the bottom. Further, the fingerlings were exposed to sublethal concentration of 96 hours 1/10th and 1/50th LC50 over 45 days. The organ tissue, viz., skin, muscle, gill, liver, kidney, brain and heart were examined for histopathological study and the changes are described and discussed.
Publisher
Association of Aquaculturists
Reference11 articles.
1. Anon. 1981. Proceedings of the 5th Workshop of AICRP on Composite Fish Culture and Fish Seed Production. CIFRI, Dhauli, Orissa, India.
2. APHA 1985. Standard Methods for the Examination of Water, Sewage and Industrial Waters. American Public Health Organisation, 10th edn. New York, pp.1134-1265.
3. Burrows, R. E., 1964. Effect of accumulated secretory products on hatchery reared salmonid. U.S. Bureau of sport. Fish. and Wild Life Res. Report. 66 pp.
4. Huey, D. W., G. F. Arkin and D. W. Crisswell, 1980. Nitrate induced methaemoglobin formation in channel catfish. Trans. Am. Fish. Soc., 109: 558-562.
5. Janakiram, K., G.R. M. Rao, S. Ayyappan, C. S. Purushothaman, P. K. Saha, K. C. Pani and H. K Muduli, 1988. A combination of commercial bleaching powder and Urea as potential pisicide. Aquaculture, 72: 287-293.