Please use this identifier to cite or link to this item: https://doi.org/10.1007/BF02274228
Title: Role of thyroid hormones in tilapia larvae (Oreochromis mossambicus): I. Effects of the hormones and an antithyroid drug on yolk absorption, growth and development
Authors: Reddy, P.K. 
Lam, T.J. 
Keywords: antithyroid drug
development
heart rate
larval growth
tilapia
tyroid hormones
yolk absorption
Issue Date: Feb-1992
Citation: Reddy, P.K., Lam, T.J. (1992-02). Role of thyroid hormones in tilapia larvae (Oreochromis mossambicus): I. Effects of the hormones and an antithyroid drug on yolk absorption, growth and development. Fish Physiology and Biochemistry 9 (5-6) : 473-485. ScholarBank@NUS Repository. https://doi.org/10.1007/BF02274228
Abstract: Treatment of one-day old yolksac larvae of tilapia (Oreochromis mossambicus) by immersion in 0.05 ppm T4 or 0.01 ppm T3 significantly accelerated the differentiation and growth of all the fins, particularly pectoral and tail fins. Both the treatments also significantly accelerated yolk absorption and transition to free-swimming activity in the larvae. The treatments also significantly accelerated the growth of the larvae, with T3 at 0.01 ppm having a greater effect than T4 at 0.05 ppm. The yolk conversion efficiency was found not to be significantly affected by the hormone treatments but the treated larvae exhibited an increased heart beat, suggesting metabolic stimulation by the hormones. On the other hand, yolk absorption and free-swimming activity were significantly delayed in tilapia larvae immersed in 25 ppm solution of an antithyroid drug, phenylthiocarbamide (PTC). PTC also retarded the growth of the larvae. T4 (0.05 and 0.10 ppm) or T3 (0.01 and 0.02 ppm) therapy removed the PTC-inhibition, albeit not completely, suggesting that thyroid hormones are involved in the larval growth and development of tilapia. © 1991 Kugler Publications bv.
Source Title: Fish Physiology and Biochemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/106887
ISSN: 09201742
DOI: 10.1007/BF02274228
Appears in Collections:Staff Publications

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