Gonadal oocyte development in LHRHa hormone treated European sea bass (Dicentrarchus labrax L., 1758) broodstock


Firat K. , SAKA Ş. , SUZER C.

TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES, vol.29, no.1, pp.83-87, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 1
  • Publication Date: 2005
  • Title of Journal : TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES
  • Page Numbers: pp.83-87

Abstract

Stages of oocyte maturation in sea bass (Dicentrarchus labrax) gonads after LHRHa hormonal treatment were investigated. LHRHa was injected into sea bass broodstock with an oocyte diameter of 527-580 mu m. A second injection was given 12 h after the first injection. For each injection a dose of 10 mu g/kg was used. At 24 h, oil globules in oocytes were randomly distributed. These oil globules started to fuse and change to a spherical shape from an ellipsoidal shape at 36 and 42 h. Ovulation was observed between 45 and 54 h after the first intramuscular injection. After 54 h from the first injection, oocytes became overripe due to no spawning occurring on time. The overripe rate in gonads was 90% at 60 h.