Manners of oyster
The adult oysters present a sexuée reproduction. oysters dig Crassostrea gigas are oviparous animals, i.e. that the fecundation of the ovules and the spermatozoïdes occurs in water with the liking of the currents. They present an alternative sexuality. They function like male or as female during one season then change sex the following year. Some hermaphrodites (having the two sexes at the same time) remains after the youthful stage, but they are rare.
The sexual life of oyster is surprising. It is hermaphrodite with its way: it changes sex each season or after each emission of seed.     Turn with turn male and female (except the first year when they all are female), the oyster reproduces one or more time during the summer. It is at this period that the oyster is milky.
  The oyster punt is viviparous. The fecundation of eggs is carried out safe from the shell. And it shelters them in one room inhaling after having laid them. Each laying produces between 500 000 to 1 500 000 eggs.  
  Less maternal, the hollow oyster is oviparous animal and expels its eggs not fertilized in the marine environment. It can lay from 20 to 100 000 000 eggs between June and August. But only ten eggs, after fecundation with the liking of the currents, will give rise to an oyster.  
    tiny larvae of 1/10ème with 2/10èmes of millimetre will wander with the liking of the currents in the search of a place where to fix itself.