Environmental impact on the induced breeding of cultivable species of carps in tarai region of Uttarakhand
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Date
2008-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The study was conducted to find out the effect of varying environmental condition on the induced breeding of carps. Experiment was conducted at College of Fisheries, Pantnagar with comparative study of different Physico-chemical parameters and breeding parameters in outdoor and indoor hatchery systems during the same breeding season and with same brood stock. The favourable environmental condition with average maximum rainfall shows maximum relative fecundity in breeding hapa than in the breeding tank during monsoon breeding season (June-July). Average breeding parameter shows optimum level at 28°C in indoor hatchery and upto 35°C in outdoor hatchery. The fluctuation in the breeding parameter is significantly decreasing towards the ending of breeding season in both hatchery systems but in outdoor hatchery it is strongly correlated with water quality parameter. The survival rate of fries also varies significantly with varying environmental condition (F=0.0008)
and dissolved oxygen shows significant influence (P=0.001) followed by water temperature (P=0.01). The comparative efficacy of inducing agents on fecundity and fertilization rate reveals that Ovaprim had better results during monsoon breeding season and WOVA-FH during late monsoon season. The significant observation was that the breeding performance was better during the conducive environmental condition in ponds as well as in indoor hatchery systems in respect to ovulation, fertilization and hatching percentage.
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