Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effect of Thyroid Hormones and Albinism during Metamorphosis of Flounder, Paralichthys olivaceus under Low Temperature Stress

넙치 변태기에 있어 저수온 스트레스가 갑상선 호르몬과 백화현상에 미치는 영향

  • YOO Jin Hyung (Division of Aqua Life Science, Yosu National University) ;
  • TAKEUCHI Toshio (Department of Aquatic Bioscience, Tokyo University of Fisheries) ;
  • JEONG Kwan Sik (Division of Aqua Life Science, Yosu National University)
  • 유진형 (여수대학교 수산생명과학부) ;
  • ;
  • 정관식 (여수대학교 수산생명과학부)
  • Published : 2003.02.01
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Abstract

Flounder (Paralichthys olivaceus) fish goes through metamorphosis in the larvae phase. In this phase, it secretes much thyroid hormone to control metamorphosis. Sharp change in the environment and nutrition deficiency may cause stress in the metamorphosis phase. It leads to interfering with the development of thyroid hormone and finally inhibits the normal growth of larvae. In this study, the correlation between the change in thyroid hormones and the albinism appearance was examined by growing them with low temperature ($13^{\circ}C$) stress over the premetamorphosis stages (stage $D\~F$) of flounder metamorphosis. Albinism rate was $15\%$ in the low temperature group and $25\%$ in the control goup. $T_{4}\;and\;T_{3}$ of the control group tended to increase from stage F as larvae grew. $T_{4}$ increased 2 times compared to the control group as 72 ng/g at stage H, the increasing phae of water temperature, in the low temperature group. $T_{3}$ increased 8 times compared to the control group as 2.9 ng/g at stage E, the decreasing phase of water temperature. Therefore, it is judged that the albinism appearance of flouner is caused from the sharp increase in $T_{3}$ by the inappropriate secretion of thyroid hormone.

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References

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