Pacific oyster (Crassostrea gigas) belongs to bivalve class, is delicious food with high nutrition and high commercial value. However, due to a immigrated species in Vietnam, therefore, a source of Pacific oyster seed is mainly supplied by artificial breeding. This research presents results on effects of spawning stimulated methods on spawning criteria of Pacific oyster. The results showed that spawning rate of oyster was highest of 40 percent when stimulated by dry exposure combined increased temperature and dry exposure combined with increased temperature and NH4OH methods
The fecundity in fact of oyster was highest of 19,242,857 eggs per female when using dry exposure and increased temperature methods. The fertilization and hatching rate were highest when induced by increased temperature method with 95.3 percent and 92.0 percent, respectively. These results are important information for building artificial breeding process of Pacific oyster as well as satisfying seed requirement for grow-out.