Ecology, Environment and Conservation Paper

COMPARISON OF THE PERFORMANCE OF MODEL CARP HATCHERY WITH CHINESE CIRCULAR HATCHERY

Laxmi, A. K. Upadhyay, H. D. Joshi and M. P. Bhendarkar

Abstract

Comparative study was conducted to find out the efficacy of model carp hatchery with best performance of Chinese circular hatchery for seed production of carp fish. Experiment was conducted at College of Fisheries, Pantnagar, India with comparative study of different Physico-chemical parameters and breeding parameters in both the hatchery systems, during the same breeding season and with same brood stock. Functioning of model carp hatchery has also being optimized for water flow rate, stocking density and hatching period, which has been found as 8 L/min, 80 thousand and 24 hrs respectively. The suitable range of water temperature as 250C to 270C and dissolved oxygen content as 9.0-11.5 ppm with almost constant pH around 7 has been recorded for best recovery. Low level of free CO2 and increasing trend of alkalinity, after hatching of eggs with highest value of alkalinity as 72 ppm was found in model carp hatchery. Increasing trend of nitrate and phosphate was found after the hatching of eggs with maximum values as 16.123 μg/L and 0.205 μg/L, respectively. Indian major carps experienced better for all breeding parameters and finally spawn recovery as compare to Chinese carps with both the systems. Comparatively model carp hatchery was found to exist the most optimal levels of different Physico-chemical parameters with slightly higher recovery than the Chinese circular hatchery, indicating the suitability of the model carp hatchery for rural and resource poor aqua farmers.