Growth study of Oreochromis mossambiccus with relation to physical parameters of a freshwater medium during the Post-monsoon season

Nagarajan | Sermamoorthy

Oreochromis mossambiccus | Post-monsoon

Vol: 4; Iss: 3; Mar 18 | ISSN: 2454-5422

Growth of the Oreochromis mossambiccus was slight improvement during the Post-monsoon season to the different physical parameters of the water in a fresh water habitat, Kullursandhai reservoir in Tamilnadu. Recorded atmospheric temperature is very low with rise of only 20C from the month of December to February. Surface water temperature is naturally lesser than the atmospheric temperature and it was found to be one degree raise during the study period. Electrical conductivity rose from 312 µS/cm to 356.0 µS/cm. Transparency value of the water increased by 1.16 cm. In accordance with the slight rise in the physical parameters the specific growth rate of the fish declined from 5.16 to 3.0. Percentage weight gain is only by 5.42 % value. This may be due to the unsettled nature of the fresh water habitat during the Post-monsoon that is after the rainy season. Therefore from the present study it was revealed that the slight change in the physical parameters have lesser effect in the growth of the Oreochromis mossambiccus.