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KMID : 0613820030130010034
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Journal of Life Science
2003 Volume.13 No. 1 p.34 ~ p.41
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Effects of 3,5,3’-triiodo-L-thyronine (T3) Immersion on Development of Fertilized Egg and Newly Hatching Larva of Black Seabream, Acanthopagrus schlegeli
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Kang Duk-Young
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Abstract
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The hatching of fertilized egg and early development of larval black seabream, Acanthopagrus schlegeli by immersion of 3,5,3’-triiodo-L-thyronine (T₃) with doses of 0.01~0.5 ppm in tank were examined for early development periods and compared with control fish immersed by 0.1 N NaOH and 99% alcohol. Larvae were fed with rotifers for first 5 days during experimental period. Yolk absorption of larvae from T₃immersion groups were significantly faster than that of control. Although hatching times among each groups were not significant difference. the hatching rates of larvae in higher doses (0.1 ppm and 0.5 ppm T₃groups) were significantly lower than control. The results of T₃immersion
experiments to newly hatching larvae indicated that exogenous T₃induced significant faster the absorption of yolk and oil globule, faster the development of myotome and digestive duct and higher the growth rate of larvae than larvae of control. These results indicate that T₃immersion supplements appear to confer a distinct advantage to eggs and larvae of black seabream, which is in early fragile developmental stage.
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KEYWORD
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Black seabream, hatching, early development.3, 5, 3‘-triiodo-L-thyronine, immersion
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