Growth characteristics by spat origin on growth of the off-bottom cultchless oyster culture, Crassostrea gigas
Suhyun Lee, Jongcheol Han, Injoon Hwang, Heewoong Kang and Hyunjeong, Lim
West Sea Fisheries Research Institute, NIFS, 14, Seonnyeobawi-ro, Jung-gu, Incheon, Korea Southeast Sea Fisheries Research Institute, NIFS, 397-68, Sanyang-eup, Tongyeong, Korea
 This study attempted to confirm the growth characteristics according to different  origin of cultchless oyster spat with off-bottom culture on West coast tidal flat using wild diploid, artificial diploid and artificial triploid spat. Oyster spats from different origin were compared with growth characteristics such as shell height, whole weight, flesh weight and survival rate. Round index and Cup index were also investigated to evaluate marketability. As a result of this experiment, the survival rate was 84-89%, and there were no difference between spat origins. The final shell height was 56.27 ± 5.45 mm for artificial triploid spat, 44.20 ± 2.66 mm for wild diploid spat and 26.15 ± 4.27 mm for artificial diploid spat, respectively. Artificial triploid spat increased by 56% compared to the initiation of an experiment, showing the highest growth rate in shell height. Among the shell shape indices, Round index was in the range of 60.70-64.08%, and there was no difference between spat origin and artificial diploid spats showed the highest value. Cup index was in the range of 36.94-41.90%, with no difference between spat origin, and artificial diploid spat showed the highest value.
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