This study examined the relationship between post-ovulation time and fertilization rates of artificially inseminated eggs of yellowtail, Seriola quinqueradiata. Ovulation was induced by a single injection of HCG (500 IU/kg) and occurred between 36 and 54 hours. The fertilization rates of the eggs collected from eleven fish decreased with time after ovulation from 92.5% (0 hour) to 16.7% (48 hours). The hatching rates of the eggs collected from the eleven fish also decreased, and were 50.3% (peak), 10.6% and finally 0% at 0, 12 and 24 hours after ovulation, respectively. These results suggest that artificial insemination of yellowtail must be carried out immediately after ovulation in order to obtain eggs of good quality.
All Science Journal Classification (ASJC) codes
- Aquatic Science