Influence of Exogenous Hormone, Human Chorionic Gonadotropin, on the Oogenesis of Giant Tiger Prawn (Penaeus monodon, Fabricius)

บทคัดย่อ

Fourty eight giant tiger prawn female broodstocks with state I ovarian development were randomly divided into six groups. Each group was received exogenous hormone, the human chorionic gonadotropin at 0, 1, 3, 6, 9 and 12 I.U./gm.. After thirty day of experiment, those who received the hormone at 1, 3 and 6 I.U./gm. showed no sign of ovarian development. Their ovaries still maintained at stage I, and consisted mainly of oogonia and immature oocytes when observed under light microscope. This results was similar to those of sham control. However, ovaries of those who received the hormone at 9 and 12 I.U./gm. developed into stage II and stage III and consisted mainly of early mature oocyte and mature oocyte.