Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effects of Oral Administrated Thyroid Hormone ($T_3$) on Physiological Condition, Growth and Survival Rate of Juvenile Rockfish (Sebastes schlegeli)

외인성 갑상선호르몬 ($T_3$)의 경구투여가 조피볼락 (Sebastes schlegeli) 치어의 생리적 상태, 성장 및 생존에 미치는 영향

  • KANG Duck-Young (National Fisheries Research & Development Institute) ;
  • CHANG Young Jin (Department of Aquaculture, Pukyong National University) ;
  • KIM Yoon (Department of Aquaculture, National Fisheries Research & Development Institute) ;
  • MYOUNG Jeong-In (Department of Aquaculture, National Fisheries Research & Development Institute)
  • 강덕영 (국립수산진흥원) ;
  • 장영진 (부경대학교 수산과학대학 양식학과) ;
  • 김윤 (국립수산진흥원 증식부) ;
  • 명정인 (국립수산진흥원 증식부)
  • Published : 2001.11.01
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Abstract

Rockfish (Sebastes schlegeli) juveniles were fed with the diets containing 0 (control and sham), 5, 10 and 15 ppm of 3,5,3'-triiodo-L-thyronine ($T_3$) for 50 days to assess the effect of the hormone on the change of physiological condition, growth and survival rate, fish were fed the commercial diet by hand to satiation 2 times per day. After 50 days, food intake, feed efficiency, thyroid cell height (TCH), abnormality, proximate body composition, growth, condition factor and survival rate were also examined. The food intake and the feed efficiency of S. schlegeli fed with diet containing 10 ppm of $T_3$ was significantly higher than those of fishes fed with the other diets. On the final day of experiment, atrophy of thyroid gland was observed in fish administered with 10 and 15 ppm of $T_3$. $T_3$increased slightly the abnormality according to the increase of $T_3$dose. The whole body proximate analyses indicated that the fishes administrated with 15 ppm of $T_3$ were the highest in protein content and were the lowest in lipid, but in ash content were there a significant effects of $T_3$. The growth of S. schlegeli fed with a diet containing 10 ppm of $T_3$ was significantly higher than that of control. The condition factor was not related to administered $T_3$ content. $T_3$ slightly improved the survival rate of juvenile S. schlegeli, and the survival rate of fish administered with 10 ppm was significantly higher than that of sham-control but was lower than that of control.

조피볼락, S. schlegeli 치어의 생리, 성장 및 생존율에 미치는 3,5,3'-triiodo-L-thyronine ($T_3$) 효과를 파악하기 위해 $T_3$를 0, 5, 10 및 15ppm으로 사료에 섞어 경구투여하였다. 실험 종료시 섭식률 및 사료효율은 10PPM구가 가장 높게 나타났으며, TCH는 처리농도가 높아질수록 낮은 TCH값을 나타내었다 실험구별 기형률은 $T_3$처리 농도가 높아질수록 높게 나타났다. 실험 종료시 체성분 분석 결과, 수분과 회분 함량은 실험구간 유의 차를 찾아 볼 수 없었고, 단백질 함량은 15PPM구가 5PPM구를 제외한 모든 실험구에 비해 많았으며, 지질 함량의 경우 15PPM구가 대조구에 비해 적었고, 5PPM구와 10PPM구는 대조구와 큰 차이가 없었다. 실험구별 길이 및 무게 성장은 10PPM구가 지속적인 성장을 보여 실험 종료시 $9.80\pm0.26 cm$로 대조구에 비해 빠른 성장을 보였다. 실험구별 비만도는 $T_3$구가 $18.9\~19.0$으로 대조구와 유의한 차이를 나타내지 않았다. 각 실험구별 사육어의 생존율은 CONTROL구가 가장 높았고, CONTROL구를 제외하고는 10PPM구가 다른 실험구에 비하여 높게 나타났다.

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