| Popis: |
The aim of our study is to evaluate the impact of ova retention in the body cavity of silver carp (Hypophthalmichthys molitrix) females after ovulation on their viability after stripping and on different development stages including mainly on the rate of fecundation, embryonic and larval development. To carry out this study of the effect of ova retention in the ovarian cavity, nine silver carp females were induced to spawn and their ova were stripped and fertilized after 30,60 and 90 minutes post-ovulation. The results indicated that fertilization and embryonic survival rates ranged respectively from 61,7 % and 61,5% at ovulation (T0) to 29,5% and 29,7% at 90 minutes post of ovulation (T90), while the survival rate of fry ranged from 87,3 % at T0 to 48,8 % at T90. In order to ensure the maximum viability of the ova of silver carp females reproduced artificially in the hatchery, it is recommended to strip and fertilize the eggs within 30 minutes after ovulation. |
