Induction of vitellogenesis and reproductive maturation in tiger shrimp,Penaeus monodonby 17ß-estradiol and 17α-hydroxyprogesterone:in vivoandin vitrostudies

Vertebrate-Type Steroid Profile in Different Tissues of Wild and Endocrinologically Manipulated Female Brood Stocks of <i>Penaeus monodon</i>

“…Our earlier studies on the in vivo treatment of P. monodon ovarian explant with 17-hydroxy progesterone showed that this hormone was effective only in vitellogenic ovary 17 . In cray fish, Cocci et al 27 also reported higher vitellogenin level in progesterone-treated females at advanced vitellogenic ovary.…”

“…In order to refine the induced maturation procedure and to manage reproduction under captivity more effectively, it is imperative to use hormones of 'gonadotropic' nature. In crustaceans, so far several hormones have been reported to have stimulating effect; for example, methyl farnesoate 13 , neurotransmitters 14 and vertebrate-type sex steroids [15][16][17] . Our recent study suggests the role of 17--estradiol and 17--hydroxyprogesterone on vitellogenesis and reproductive maturation of P. monodon 17 .…”

“…In crustaceans, so far several hormones have been reported to have stimulating effect; for example, methyl farnesoate 13 , neurotransmitters 14 and vertebrate-type sex steroids [15][16][17] . Our recent study suggests the role of 17--estradiol and 17--hydroxyprogesterone on vitellogenesis and reproductive maturation of P. monodon 17 . Establishment of concomitant changes in the concentration of sex steroids in the hemolymph and specific reproductive tissues is the primary source to confirm the regulatory role of individual hormones 18 .…”

Effect of ecdysteroids on oogenesis in the freshwater crab Travancoriana schirnerae Bott, 1969 (Crustacea: Gecarcinucidae)

“…Medesani et al (2015) observed significantly increased ovarian indices and vitellogenin levels in female Neohelice granulata fed with 17α-OH progesterone pelleted feed. In the tiger prawn Penaeus monodon, in vivo and in vitro administration of 17β-estradiol and 17α-OH progesterone persuaded vitellogenesis and ovarian maturation (Merlin et al, 2015). Oogenesis was hastened in Parapenaeopsis stylifera and Chasmagnathus granulata administered with steroid hormones (Nagabhushanam et al, 1987: Zapata et al, 2003.…”

Mechanisms and control of vitellogenesisin crustaceans

“…In a recent collaborative study of the author, the expression pattern of vertebrate steroid receptors, coinciding with vitellogenin synthesis in ovary and hepatopancreas of the penaeid shrimp P. monodon, has been investigated, adducing further evidence on their role in the control of vitellogenin synthesis. 3,4) In addition, this group also demonstrated a dual role for biogenic amines in vitellogenin synthesis and meiotic maturation in another shrimp, P. indicus. 5) A combination of eyestalk ablation with administration of sex steroids could form an eŠective method to enhance vitellogenesis in the commercially important shrimp species.…”