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Optimum Stocking Density of 3-year-old Pacific Abalone, Haliotis discus hannai Reared in Net Cage Culture

3년산 북방전복, Haliotis discus hannai의 해상가두리 양성 시 적정 수용밀도

  • Lee, Si-Woo (Southwest Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Byeong-Hak (Southwest Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Tae-Ik (Southwest Sea Fisheries Research Institute, NFRDI) ;
  • Son, Maeng-Hyun (Southwest Sea Fisheries Research Institute, NFRDI)
  • 이시우 (국립수산과학원 남서해수산연구소) ;
  • 김병학 (국립수산과학원 남서해수산연구소) ;
  • 김태익 (국립수산과학원 남서해수산연구소) ;
  • 손맹현 (국립수산과학원 남서해수산연구소)
  • Received : 2015.06.23
  • Accepted : 2015.06.29
  • Published : 2015.06.30

Abstract

The effects of different stocking densities on the growth and survival rate of the 3-year-old pacific abalone, Haliotis dicus hannai were investigated in marine net cage for a year. Stocking densities in net cage ($2.4{\times}1.2m$) was set 15, 30, 45 and 60 percentage (= per)/sq m (square meter, $m^2$) with share to cross-sectional area per shelter. The water temperature during the testing period was $8.2^{\circ}C-22.1^{\circ}C$, and salinity is $33.5{\pm}0.6psu$, and dissolved oxygen is $7.87{\pm}0.86mg/L$. In the shell length (initial size : $71.50{\pm}2.28mm$) growth and shell breadth (initial size : $46.43{\pm}2.28mm$) of the test abalones, the absolute growth rate (ARG), daily growth rate (DGR) and specific growth rates (SGR) of the 15 per/sq m and 30 per/sq m were higher than those of 45 per/sq m and 60 per/sq m density group (P < 0.05). Also in the weight (initial weight : $35.7{\pm}8.1g$), it showed the same results. In survival rates, it were that 15 per/sq m and 30 per/sq m is significantly higher than 45 per/sq m and 60 per/sq m. Therefore, it was that the 15 per/sq m is optimized stocking density in marine net cages about the 3-year-old pacific abalone over 70 mm size. The result shown that total cross-sectional area under the shelter is based on 15 per/sq m ($2.4{\times}2.4m$, 354 number in a net cage) is suitable for fast growth and survival. But if the economy consider, optimized stocking density would be appropriate to accept 30 per/sq m ($2.4{\times}2.4m$, 710 number in a net cage).

본 연구는 3년산 북방전복을 해상가두리에서 1년 동안 수용밀도별로 양식순기에 따라 사육하여 성장 및 생존율 조사를 통해 적정 수용밀도를 구명하고 생산성을 향상시키고자 수행하였다. 해상가두리 ($2.4{\times}1.2m$) 내 수용밀도는 셀터 단면적 (square meter, $m^2$, sq m) 당 점유율로 15, 30, 45, 60 percentage (= per)/sq m로 설정하여 2반복으로 실시하였다. 사육기간 동안 수온은 $8.2^{\circ}C-22.1^{\circ}C$, 염분은 평균 $33.5{\pm}0.6psu$, 용존산소는 평균 $7.87{\pm}0.86mg/L$이었다. 월별 각장변화에서는 2014년 5월, 7월부터 10월, 2015년 4월에 15 per/sq m, 30 per/sq m가 45 per/sq m, 60 per/sq m보다 유의적으로 높았다 (P < 0.05). 각장의 FML, AGR, DGR, SGR과 각폭의 FMB, AGR, DGR은 15 per/sq m와 30 per/sq m는 45 per/sq m, 60 per/sq m보다 유의적으로 높았고 (P < 0.05), 각폭의 SGR에서 60 per/sq m는 모든 실험구 보다 낮았다 (P < 0.05). 중량에 대한 FMW, WG, DWG, SWG에서도 같은 결과를 나타내었다 (P < 0.05). 생존율에서는 15 per/sq m, 30 per/sq m가 50%이상으로 45 per/sq m, 60 per/sq m 보다 유의적으로 높았다 (P < 0.05). 따라서, 본 실험결과 70 mm 이상의 3년산 북방전복의 해상가두리 내 적정 수용밀도는 셀터 총 단면적 기준으로 15 per/sq m ($2.4{\times}2.4m$, 1칸 당 354마리) 가 빠른 성장과 생존율을 위한 적정 수용밀도지만 경제성을 고려할 경우 30 per/sq m ($2.4{\times}2.4m$, 1칸 당 710마리) 수용해야 한다.

Keywords

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