Sequential of sex steroids and cortisol levels in farmed stellet sturgeon (Acipenser stellatus Pallas) female brooders after induced ovulation by GnRH (Ova-Fact Ш)
Subject Areas : New Technologies in Aquaculture Development
Keywords: Ovulation, Keywords: Sex steroids, Cortisol, GnRH, Farmed stellate sturgeon,
Abstract :
Abstract Blood serum testosterone (T), progesterone (P4), estradiol (E2) and cortisol concentrations were measured by radio-immunoassay (RIA) in farmed stellate sturgeon (Acipenser stellatus) female breeders during final maturation (FM) induced by GnRH (Ova-FactШ). After the detection of polar indices (PI=10-14) and hormonal survey in female breeders was carried out to induce by GnRH in 2 stage with 10µg/kg dose with interval 12 hour. Three blood samples were taken from females in timing 0, 12, 24 h after injection. Results showed there was a significant of sex steroid T, P4, E2 and cortisol levels in non-ovulated (n=2) with ovulated (n=5) fish. T, P4, E2 levels were decreased after ovulastion while cortisol increased. The data indicates that sex steroids, especially T, in farmef femal stellate sturgeon brood stock had important role in ovulation also T concenteration in non-ovulated females were significantly lower than in ovulated fish (P<0.05). The rise in cortisol level may indicate an interaction between corticosteroids and gamete maturation in farmed stellate sturgeon.
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