Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Optimum Conditions for Denitrification and Fish Growth in a Seawater Recirculating System

해수 탈질시스템에서 적정 탈질조건과 어류의 사육효과

  • SON Maeng Hyun (Aquaculture Division, East Sea Fisheries Research Institute, NFRDI) ;
  • JEON Im Gi (Aquaculture Division, South Sea Fisheries Research Institute, NFRDI)
  • 손맹현 (국립수산과학원 동해수산연구소) ;
  • 전임기 (국립수산과학원 남해수산연구소)
  • Published : 2003.10.01
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Abstract

This study was to survey proper condition of nitrate removal by hydraulic retention time (HRT) and measured growth of black rockfish (Sebastes schlegeli) and giant croaker (Nibea japonica) in the seawater recirculating culture system designed for nitrate removal. Nitrate conversion to nitrogen at 8 hr-HRT was higher than 16 hr-HRT, amounting to $32.2\;g/m^3/day$ in the seawater recirculating culture system. The removal efficiency of nitrate improved when dissolved oxygen was situated less than 0.5 mg/L. Daily growth rate (DGR) and feed efficiency (FE) of S. schlegeli with mean body weight of 108 g in 8 hr-HRT were significantly higher values than those in 4 hr-HRT (P<0.05). The DGR and FE of N. japonica with mean body weight of 12 g in added carbon system showed not differing in the values from N. japonica in control system (P>0.05).

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References

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