전자저널 > 전자저널 > The Development of Larvae and Egg of Flatoyster, Ostrea denselamellosa in Korea

The Development of Larvae and Egg of Flatoyster, Ostrea denselamellosa in Korea

Moon- Ho Yang, Chang Hee- Han, Sang- Duk Choi and Hyung- Sub Kim

South Sea Fisheries Reseach Institute, National Fisheries Reseach and Development Agency, Yosu 555-820, Korea

We investigated the processes of egg and larva l developments for aquaculture techmique development of seedling production of the flat oyster, Ostrea dense lamellosa. The flat oyster of larviparous type was diffe rent from the pacific oyser (oviva rous type) beca use their larvae (trochophore and prodis soconch larvae) in the gill released into the seawater. The proces s of egg development was observed by artificial fertilization at 25 ℃, using a dissecting method. The sizes of Unfertilized eggs ranged from 80 to 90 m and fertilized eggs with globule-shape was 90-100 m. The Polar body appeared after fertilization and egg cleavage began within 1 hour, reaching the blastula stage after 10 hours . The trochophore in the gill appeared 2-3 days after fertilization and grew to the prodissoconch larvae (130 ×140 m) hving a complete shell after 1-2 days . The shell of prodissoconch larvae grew to 205 ×220 m after 10 hours , and then they became umbostage larvae showing oval in shape . The velum of umbostage larvae was degenerated a bout 17-20 days afte rfertilization and grew into a pediveliger with a developed foot, at this time , the shell length size was 320 ×360 m.

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