Profiles of Plasma Sex Steroid Hormone and Vitellogenin According to Ovarian Development of the Oblong Rockfish Sebastes oblongus

황점볼락 난소 발달에 따른 혈중 성호르몬과 난황단백전구체의 변동

  • 김대현 (국립수산과학원 남해수산연구소) ;
  • 정지현 (한국해양연구원) ;
  • 윤성종 (국립수산과학원 양식관리과) ;
  • 황형규 (국립수산과학원 남해수산연구소) ;
  • 이윤호 (국립수산과학원 남해수산연구소) ;
  • 김대중 (국립수산과학원 남부내수면연구소)
  • Published : 2009.02.25


To understand the steroidogenic activities and plasma vitellogenin (VTG) profiles according to the reproductive phases in the oblong rockfish Sebastes oblongus, we examined changes in sex steroid hormones and plasma vitellogenin. Plasma levels of testosterone (T) was significantly higher value in only ovulation stage (P<0.05). In vitellogenesis, plasma estradiol-$17{\beta}$ ($E_2$) had a high level in August which was a similar higher level until ovulation than other ovarian development stages (P<0.05). However, $E_2$ was significantly decreased after embryo stage (P<0.05). This indicates that variability in $E_2$ at different stage is associated with the development of the oocytes. Plasma levels of $17{\alpha}$, $20{\beta}$-dihydroxy-4-pregnen-3-one (DHP) were significantly high at the stages of vitellogenesis and ovulation (P<0.001). It is assumed that DHP plays an important role in vitellogenesis. Also, We determined the plasma levels of vitellogenin (VTG) divided the development stage into four steps: immaturation, vitellogenesis, and ovulation and parturition. A significant lower levels of VTG were shown in immaturation and parturition (P<0.05), which did not discriminate between them. However, in vitellogenesis and ovulation were shown in a remarkable higher levels of VTG(P<0.05), but not significantly different between them. Consequently, plasma VTG levels were considerably increased after October and maintained a higher concentration until ovulation, but significantly decreased after ovulation. It is suggested that VTG plays also an important role in the development of vitellogenesis and oogenesis.


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