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ISSN : 1225-3480
In the present study, we monitored the early development of Saccostrea kegakia subtropical oyster speciesdistributing on rocky intertidal off the northern Jeju Island using scanning electron microscope (SEM). The femaleoyster collected in early August, 2012 were fully mature exhibiting relatively small eggs (46.5 ± 1.4 μm in diameter)in the gonad, while testis of the mature male oysters were filled with fully developed sperms of 36.9 μm in length. The fertilized eggs developed into 2-cell stage with polar body after 1 hr 20 min of fertilization, then followed byMorula stage (3 hr 20 min), Blastula stage (4 hr 50 min), Gastrula stage (7 hr), and trochophore larvae stage (9 hr30 min). The observed early development of S. kegaki in this study was similar the early development of otheroysters, although size of the fertilized eggs were somewhat smaller.
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