The micropyle region of the eggs of Pacific herring (Clupea pallasi) has been shown to play an active role in the activation of herring sperm (Yanagimachi and Kanoh, 1953; Yanagimachi, 1957; Yanagimachi et al., 1992; Pillai, et al., 1993; Griffin et a . . .

Sperm of the Pacific herring are immotile at spawning. Two egg-derived molecules are capable of initiating sperm motility. One is herring sperm activating protein(s) (HSAPs) and the other is sperm motility initiation factor (SMIF). These two motility . . .