Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Changes in water quality and hematological parameters according to the stocking density of olive flounder, Paralichthys olivaceus raised in bio-floc environment

바이오플락 양식기술 적용 넙치, Paralichthys olivaceus 수용밀도에 따른 수질변화 및 혈액학적 성상 변화

  • Kim, Jun-Hwan (West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Jeong, Eun-Ha (West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Seok-Ryel (West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Su Kyoung (West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Su-Kyoung (West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Hur, Young Baek (West Sea Fisheries Research Institute, National Institute of Fisheries Science)
  • 김준환 (국립수산과학원 서해수산연구소) ;
  • 정은하 (국립수산과학원 서해수산연구소) ;
  • 김석렬 (국립수산과학원 서해수산연구소) ;
  • 김수경 (국립수산과학원 서해수산연구소) ;
  • 김수경 (국립수산과학원 서해수산연구소) ;
  • 허영백 (국립수산과학원 서해수산연구소)
  • Received : 2019.04.22
  • Accepted : 2019.05.22
  • Published : 2019.06.30
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Abstract

The Paralichthys olivaceus (mean weight 34.3±3.5 g) was used in the conduction of density experiment in this study to establish the optimal density determination for a period of 13 weeks. The density consisted of four groups. These were group 1 (500 fish, 40 fish m-2), group 2 (750 fish, 60 fish m-2), group 3 (1,000 fish, 80 fish m-2) and group 4 (1,250 fish, 100 fish m-2), each in 12.56 ㎡ circular water tanks. In the high density groups, such as groups 1 and 2, the nitrite was increased to over 21 mg L-1 (group 3) and 25 mg L-1 (group 4). The experiment of the groups was terminated by skin ulcers and mortality after 49 days for group 3 and 43 days for group 4. The water quality environment, such as the water temperature, dissolved oxygen, salinity and pH, remained constant. The ammonia and nitrite in groups 1 and 2 remained stable after ammonia and nitrite peak. However, the experiments in groups 3 and 4 were terminated due to the mortality induced by high nitrite. Hematological parameters, such as hemoglobin and hematocrit, were significantly decreased in the high density groups. The plasma components were significantly changed in the high density groups, such as groups 3 and 4. The mean weight of groups 1 and 2 after 13 weeks were 91.3 g and 83.7 g, respectively. The survival rates were 99.4% and 98.2%, respectively. The final FCR was 0.6 in both groups. The results of this study show that the density of 80 fish m-2 or more induce mortality due to high nitrite with hematological changes. Additionally, they indicate that the 60 fish m-2 indicate proper density in bio-floc environment in olive flounder weighing less than 100 g.

본 연구에서 바이오플락 환경에서 적정 밀도 구간 산정을 위한 실험을 진행했으며, 본 실험의 결과 밀도 구간 Group 1 (40마리 m-2)과 Group 2 (60마리 m-2)에서는 수질 안정을 통해 생리적 변화 없이 13주간 실험이 이루어졌지만, 밀도 구간 Group 3 (80마리 m-2)과 Group 4 (100마리 m-2)에서는 아질산염 안정화 실패, 혈액성상 및 혈장성분의 변화를 나타내었다. 물론, 유수를 하지 않는 바이오플락 시스템 특성상 고밀도 구간에 따른 밀도 스트레스뿐만 아니라, 고밀도 구간의 수질불안정에 따른 높은 암모니아 및 아질산 농도에 따른 영향도 복합적으로 고려해야 할 것이다. 본 실험의 결과 밀도 60마리 m-2까지의 밀도 구간에서 수질안정과 함께 혈액학적 성분의 유의적 변화 없이 100 g 크기의 넙치 사육양성에 적합할 것으로 보인다.

Keywords

References

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