AbstractThe objective of this study was to investigate the effect of different concentrations of estradiol-17 � on lethal concentration, survival rate and amount of muscular tissue of giant freshwater prawn embryos. The embryos, 1 day, after spawning were treated with 15% artificial seawater (ASW) which served as a control. The treatments were 10, 50, 100 and 150 �g/ml estradiol-17� for two days. The results showed that LC50 was more than 150 �g/ml estradiol-17�. The lowest of survival rate was 43.66 % observed in 150 �g/ml estradiol-17�. The highest survival rate was 48.16 % observed in 50 �g/ml estradiol-17�. Eyes were observed at day 8, 10, 12, 14, and 16 after spawning. The results showed that the eyes of embryos treated with 50 �g/ml and 150 �g/ml estradiol-17� were distinct and could be observed on day 12. The muscular tissue was studied on day 20 after spawning. The results showed that the muscle cells and bundles were gradually more compact with increasing of concentrations of estradiol-17 �. The embryos treated with 50 �g/ml estradiol-17 � had larger and stronger bundles of muscles than the control. Moreover embryos which were treated with 150 �g/ml estradiol-17 � had larger bundles which were denser and stronger than under the other treatments. The data showed that estradiol-17 � could be added to the food of farmed giant freshwater prawns.

Effect of estradiol-17 β on embryos of the giant freshwater prawn, <i>Macrobrachium rosenbergii</i>(de Man)

240th National Meeting (2010)

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Effect of estradiol-17 β on embryos of the giant freshwater prawn, Macrobrachium rosenbergii(de Man)