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Thyroid hormones promote early metamorphosis in grouper (Epinephelus coioides) larvae

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ရက်စွဲ
1998
စာရေးသူ
de Jesus, Evelyn Grace T.
Toledo, Joebert D.
Simpas, Marissa S.
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100
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စိတ္တဇ
The response of grouper larvae to the thyroid hormones, thyroxine (T4) and triiodothyronine (T3), was examined. Two-, 3-, and 4-week-old grouper larvae were reared in seawater containing either T4 or T3 at 0.01, 0.1, and 1 ppm. T4 or T3 induced metamorphosis in all age groups in a dose-dependent manner. Regardless of the size of the larvae, metamorphosis was completed in 2 days in larvae treated with 1 ppm of either T4 or T3; 3–4 days in larvae exposed to 0.1 ppm; and 5–6 days in larvae immersed in 0.01 ppm. None of the fish in the control group completed metamorphosis during this period. Compared with the control fish, survival rates were higher in groups exposed to 0.01 ppm and lower in those exposed to 1 ppm of T3. In 4-week-old larvae, T4 treatment (0.01 to 1.0 ppm) resulted in higher survival compared to the control. These results suggest that a dose of 0.01 ppm is appropriate for acceleration of metamorphosis and improvement of survival in 3- and 4-week-old grouper larvae. A lower dose may be apropriate for earlier stages.
URI
http://hdl.handle.net/10862/1735
Suggested Citation
de Jesus, E. G. T., Toledo, J. D., & Simpas, M. S. (1998). Thyroid hormones promote early metamorphosis in grouper (Epinephelus coioides) larvae. General and Comparative Endocrinology, 112(1), 10-16. https://doi.org/10.1006/gcen.1998.7103 
DOI
10.1006/gcen.1998.7103
ဘာသာရပ်
fish larvae ASFA; hormones ASFA; metamorphosis ASFA; rearing techniques ASFA; thyroid gland ASFA; survival ASFA; mortality ASFA; Epinephelus coioides AGROVOC; thyroxine AGROVOC; growth control AGROVOC; triiodothyronine AGROVOC; development AGROVOC; groupers AGROVOC
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