Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Effects of Water Temperature, Stocking Density and Feeding Frequency on Survival and Growth in the Oblong Rockfish Sebastes oblongus Larvae

황점볼락, Sebastes oblongus의 자·치어 성장과 생존에 미치는 수온, 사육밀도와 먹이공급 횟수의 영향

  • 윤성종 (국립수산과학원 남해수산연구소) ;
  • 김대현 (국립수산과학원 남해수산연구소) ;
  • 황형규 (국립수산과학원 남해수산연구소) ;
  • 송기철 (국립수산과학원 서해수산연구소) ;
  • 김영철 (부경대학교 양식학과)
  • Received : 2007.04.13
  • Accepted : 2007.06.05
  • Published : 2007.06.30
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Abstract

The oblong rockfish, Sebastes oblongus has recently drawn attention from aquaculturists because of its marketable value and tolerance against winter water temperature in the southern coastal waters of the Korean peninsula. In the study of temperature effect on growth, water temperature $16^{\circ}C$ showed best growth. The upper temperature of the fish showed feeding activity was $27^{\circ}C$ over which the fish showed no longer feeding activity. Stocking density was also a critical factor affecting the growth and survival of the juvenile fish. The best growth was in the density of 200 juveniles/L, while the highest survival was in the density of 100 juveniles/L. A feeding experiment was conducted to determine the effects of feeding frequency on growth and survival. A feeding scheme of twice a day was good enough in the sense of growth, survival, and economy. These results indicate that parameters such as water temperature, density, tank size and feeding frequency are consideration for best seed production of the fish.

수온 내성에서 적정 수온과 고수온 노출시의 변화를 살펴본 결과, 적정 수온에서 황점볼락 치어 사육 시 수온에 따른 성장 시험은 사육수온 $16^{\circ}C$에서 성장이 좋게 나타났으며(P<0.05), 고수온 노출 실험에서 먹이섭취반응은 $28^{\circ}C$ 실험구에서 먹이섭취반응이 미약하였으나, $27^{\circ}C$ 이하의 실험구에서는 비교적 활발한 경향을 보여 주었다. 밀도별 실험에서 성장은 실험개시 후 30일째부터 성장 차이를 보이기 시작하여, 실험종료 시에는 L당 1마리 수용한 실험구가 가장 성장이 빨랐으며, 반면 가장 고밀도인 250마리 실험구가 성장이 가장 늦게 나타났다(P<0.05). 생존율은 사육밀도가 높아짐에 따라 낮아지는 경향을 보였다. 사료 공급 횟수는 1일 2회 (10:00, 19:00) 사료를 공급한 실험구에서 가장 좋은 성장을 보였고(P<0.05), 생존율도 다른 실험구보다 좋은 72.5%의 결과를 보여주었다.

Keywords

References

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