Influences of ultrasound on the hatching of the fish eggs

We investigated the stimulation efects of ultrasonic waves on the hatching of Caras-sius auratus and Paramisgurnus dabryanus (Sauvage) zygotes.Tte results showed that the ultrasound with certain frequencies and intensities can promote the development of zygotes,induce the embryos to break membrane earlier with a definite period,and increase the survival rate of larvas.And it can increase 50% hatching rate of Paramisgurnus dabryanus (sauvage) zygots in lower temperatue.