 Yet, the eggs from a small sample of females (about six) are more commonly stripped from the gonads using Pasteur pipettes and fertilized by sperm from a similar number of males.Pacific oysters have a pelagic veliger larval stage which lasts from 14–18 days.In the hatcheries, they are kept at temperatures of 25-28 °C with an optimum salinity between 20 and 25%.