A new tool for induced spawning: The use of 17α-hydroxy-20β-dihydroprogesterone to spawn carp at low temperature |
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| Authors: | B Jalabert B Breton E Brzuska A Fostier J Wieniawski |
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| Institution: | 1. I.N.R.A., Laboratoire de Physiologie des Poissons, 78350 Jouy-en-JosasFrance;2. Akademia Rolnicza, Instytut Zoologü Stosowanej, Al. Mickiewicza 24/28, 30 059 KrakówPoland;3. Instytut Rybactwa ?rodladowego, Zaklad Gospodarki Stawowej, Zabieniec k/Warszawy, 05500 PiasecznoPoland |
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| Abstract: | The efficiency of different hormonal treatments to induce ovulation of carp at low temperatures (13–15°C) was tested. “Priming” with a low dose (0.6 mg/kg) of carp pituitary extract was found necessary for a subsequent successful treatment with 17α-hydroxy-20β-dihydroprogesterone (17α-20β P) (2 mg/kg) 1 day later. The eggs produced by this method showed satisfactory fertilization (75–96%) and hatching success (70%).On the other hand, normal hypophysation (5.4 mg/kg) following priming resulted only in partial ovulation and oocyte resorption at this temperature.Priming was shown to increase the gonadotropin level in plasma from about 2 to 35 ng/ml and to induce germinal vesicle migration toward the periphery of oocytes. Neither 17α-20β P nor desoxycorticosterone alone or in association gave any positive result in the absence of a preliminary priming. |
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