A comparison study for high-density settlement using post larvae ark shell, Scapharca subcrenata
Jongcheol Han, Injun Hwang, Jungha Kang and Heewoong Kang
West Sea Fisheries Research Institute, NIFS, 14, Seonnyeobawi-ro, Jung-gu, Incheon, Korea Southeast Sea Fisheries Research Institute, NIFS, 397-68, Sanyangilju-ro, Sanyang-eup, Tongyeong, Korea
The purpose of this study is to improve economical seed production of ark shell, Scapharca subcrenata by remote induced setting method. The setting rate according to the ark shell setting method differed from the set on net by 5.7% and high-density settlement system (Downwelling system) by ranging from 11.1-19.8%. Setting rate of high-density system was significantly influenced by initial stock in density were setting rate of high-density system was variable, at stocking density 30 × 104 individuals per setting aquarium with a setting rate 19.8%. however setting rates of between 60-90 × 104 individuals per setting aquarium were 13.8-11.1%, with higher density leading to higher setting rate. Using substrate in the high-density setting system, the setting rate was investigated and without substrate, microcultch 300 mL and microcultch 600 mL experimental condition with a non substrate condition was 17.2%, the microcultch 300 mL condition was 14.1%, the microcultch 600 mL condition 13.8%. The stimulation of increased setting rate by less substrate as microcultch, a situation beneficial to setting efforts for the species. As a result of investigating the new setting method of S. subcrenata artificial seeds, the hige-density setting method (Downwelling system) was able to produce 85 times higher per unit area than existing natural setting method, and it is expected that mass artificial seed production, S. subcrenata will be possible.
  
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