Effects of cortisol on growth and development in tilapia larvae,Oreochromis mossambicus |
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| Authors: | A Mathiyalagan P K Reddy Professor T J Lam |
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| Institution: | (1) Department of Zoology, National University of Singapore, Lower Kent Ridge Road, 119260 Singapore;(2) Present address: Department of Biomedical Sciences, University of Guelph, N1G 2W1 Guelph, Ontario, Canada |
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| Abstract: | Treatment of one-day-old yolksac larvae of tilapia (Oreochromis mossambicus), by immersion in cortisol solution for two weeks, significantly enhanced growth. The standard length, tail length, head width and wet weight showed dose-dependent increases at concentrations of cortisol (hydrocortisone) from 0.05 ppm to 0.5 ppm, with no further increase at 1.0 ppm. However, cortisol at 5.0 ppm retarded the growth of the larvae without causing any morphological abnormality. Yolk absorption and the onset of free-swimming activity in the larvae were also accelerated by cortisol treatment. |
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| Keywords: | cortisol development growth tilapia larva and free-swimming |
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