The influence of oocyte maturational stage on hatching and triploidy rates in hybrid (bester) sturgeon, Huso huso × Acipneser ruthenus
Identifieur interne : 000F70 ( Main/Curation ); précédent : 000F69; suivant : 000F71The influence of oocyte maturational stage on hatching and triploidy rates in hybrid (bester) sturgeon, Huso huso × Acipneser ruthenus
Auteurs : Naotaka Omoto [Japon] ; Mamoru Maebayashi [Japon] ; Shinji Adachi [Japon] ; Katsutoshi Arai [Japon] ; Kohei Yamauchi [Japon]Source :
- Aquaculture : (Amsterdam) [ 0044-8486 ] ; 2005.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Aquiculture, Milieu marin.
English descriptors
- KwdEn :
Abstract
We have investigated the relationship between maturational competence and hatching rate of eggs ovulated following injection of lutenizing hormone releasing hormone ethylamide (LH-RHa) in the cultured hybrid (bester) sturgeon (Huso huso female×Acipenser ruthenus male). Among 10 steroids tested (including progesterone) in a previous study, 17α-hydroxyprogesterone (17αOHP) was the most potent inducer of final maturation in the bester, with results similar to 17a,20p,21-trihydroxy-4-pregnen-3-one and 17α,20β-dihydroxy-4-pregnen-3-one. We therefore used 17αOHP to estimate maturational competence in the present study. In vitro oocyte maturation response to 17αOHP at a concentration of 0.1 μg/ml was correlated with ovulatory response to hormone treatment and quality of ovulated eggs. Two females exhibited higher in vitro oocyte maturation rate (100% germinal vesicle breakdown), ovulated sooner after hormone injection, and also had a higher hatching rate (77, 92%). In the F2 bester broodstock with a lower hatching rate (10-21%), a higher incidence (15-64%) of spontaneous triploidy was found. These results indicate that maturational competence can be estimated by in vitro oocyte maturation response to 17αOHP at 0.1 μg/ml and that this is a useful technique for selecting the proper female for breeding. Ovulatory success, hatching rate and occurrence of triploidy are thus all predictable in the cultured bester.
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<term>Aquaculture</term>
<term>Egg</term>
<term>Hatching</term>
<term>Huso huso</term>
<term>Hybrid</term>
<term>In vitro</term>
<term>Marine environment</term>
<term>Oocyte</term>
<term>Oocyte maturation</term>
<term>Spawning</term>
<term>Triploidy</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Ovocyte</term>
<term>Eclosion</term>
<term>Triploïdie</term>
<term>Hybride</term>
<term>Frai</term>
<term>Oeuf</term>
<term>In vitro</term>
<term>Maturation oeuf</term>
<term>Aquiculture</term>
<term>Milieu marin</term>
<term>Acipenser sturio</term>
<term>Huso huso</term>
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<front><div type="abstract" xml:lang="en">We have investigated the relationship between maturational competence and hatching rate of eggs ovulated following injection of lutenizing hormone releasing hormone ethylamide (LH-RHa) in the cultured hybrid (bester) sturgeon (Huso huso female×Acipenser ruthenus male). Among 10 steroids tested (including progesterone) in a previous study, 17α-hydroxyprogesterone (17αOHP) was the most potent inducer of final maturation in the bester, with results similar to 17a,20p,21-trihydroxy-4-pregnen-3-one and 17α,20β-dihydroxy-4-pregnen-3-one. We therefore used 17αOHP to estimate maturational competence in the present study. In vitro oocyte maturation response to 17αOHP at a concentration of 0.1 μg/ml was correlated with ovulatory response to hormone treatment and quality of ovulated eggs. Two females exhibited higher in vitro oocyte maturation rate (100% germinal vesicle breakdown), ovulated sooner after hormone injection, and also had a higher hatching rate (77, 92%). In the F<sub>2</sub>
bester broodstock with a lower hatching rate (10-21%), a higher incidence (15-64%) of spontaneous triploidy was found. These results indicate that maturational competence can be estimated by in vitro oocyte maturation response to 17αOHP at 0.1 μg/ml and that this is a useful technique for selecting the proper female for breeding. Ovulatory success, hatching rate and occurrence of triploidy are thus all predictable in the cultured bester.</div>
</front>
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