EsturgeonV1, Main, Merge, bibRecord, 001182

Early identification of sex in cultured white sturgeon, Acipenser transmontanus, using plasma steroid levels

Identifieur interne : 001182 ( Main/Merge ); précédent : 001181; suivant : 001183

Early identification of sex in cultured white sturgeon, Acipenser transmontanus, using plasma steroid levels

Auteurs : Grant Feist [États-Unis] ; Joel P. Van Eenennaam [États-Unis] ; Serge I. Doroshov [États-Unis] ; Carl B. Schreck [États-Unis] ; Richard P. Schneider [États-Unis] ; Martin S. Fitzpatrick [États-Unis]

Source :

Aquaculture : (Amsterdam) [ 0044-8486 ] ; 2004.

RBID : Pascal:04-0274061

Descripteurs français

Pascal (Inist)
- Sexe, Plasma, Aquiculture, Acipenser transmontanus.
Wicri :
- topic : Aquiculture.

English descriptors

KwdEn :
- Acipenser transmontanus, Aquaculture, Plasma, Sex.

Abstract

In sturgeon aquaculture, it is advantageous to sex fish as early as possible so that males can be used for meat production and females reserved for caviar production. Currently, growers wait 3 to 4 years before fish are sexed by an invasive surgical examination of the gonads. The goal of this study was to determine when sex could be determined by examining levels of plasma steroids. Populations of white sturgeon were held at three locations and water temperatures (Oregon-13 ± 0.1 °C, Idaho-15 ± 0.1 °C and California-18 ± 0.5 °C). Blood was sampled every 3 months and plasma testosterone (T), 11-ketotestosterone (KT) and estradiol (E2) concentrations were measured by radioimmunoassay (RIA). By 18 months of age, males from California had significantly higher levels of T and KT than females. By 21 months, all males could be separated from females based on T and KT content (>2 ng/ml). However, males and females from Idaho and Oregon had similar levels of T and KT up to 36 and 34 months of age, respectively, and sex could not be delineated based on plasma sex steroid content. There were no differences in E2 levels between males and females in all populations, and at all sample periods. Histological analysis of gonads revealed that all but one of the males from California had well differentiated testes with spermatogonia undergoing mitosis in cysts (stage 2), whereas the testes of all fish from Idaho and Oregon had just begun to differentiate (stage 1). Growth rates of fish were highest in California, intermediate in Idaho and lowest in Oregon. It appears that proliferation of spermatogonia is necessary for production of androgens and that growth rate, as influenced by water temperature, is the main contributor to the early onset of this process. This study has developed a less invasive technique for ascertaining sex in white sturgeon that can be used 1 to 2 years earlier than current methodologies.

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Pascal:04-0274061

Le document en format XML

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<author><name sortKey="Feist, Grant" sort="Feist, Grant" uniqKey="Feist G" first="Grant" last="Feist">Grant Feist</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Early identification of sex in cultured white sturgeon, Acipenser transmontanus, using plasma steroid levels</title>
<author><name sortKey="Feist, Grant" sort="Feist, Grant" uniqKey="Feist G" first="Grant" last="Feist">Grant Feist</name>
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<author><name sortKey="Van Eenennaam, Joel P" sort="Van Eenennaam, Joel P" uniqKey="Van Eenennaam J" first="Joel P." last="Van Eenennaam">Joel P. Van Eenennaam</name>
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<sZ>2 aut.</sZ>
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<author><name sortKey="Doroshov, Serge I" sort="Doroshov, Serge I" uniqKey="Doroshov S" first="Serge I." last="Doroshov">Serge I. Doroshov</name>
<affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Department of Animal Science, One Shields Avenue, University of California</s1>
<s2>Davis, CA 95616</s2>
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<author><name sortKey="Schreck, Carl B" sort="Schreck, Carl B" uniqKey="Schreck C" first="Carl B." last="Schreck">Carl B. Schreck</name>
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<author><name sortKey="Schneider, Richard P" sort="Schneider, Richard P" uniqKey="Schneider R" first="Richard P." last="Schneider">Richard P. Schneider</name>
<affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Clear Springs Foods Inc., 1500 East 4424 North</s1>
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<author><name sortKey="Fitzpatrick, Martin S" sort="Fitzpatrick, Martin S" uniqKey="Fitzpatrick M" first="Martin S." last="Fitzpatrick">Martin S. Fitzpatrick</name>
<affiliation wicri:level="2"><inist:fA14 i1="05"><s1>Department of Environmental Quality, 811 SW Sixth Avenue</s1>
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<series><title level="j" type="main">Aquaculture : (Amsterdam)</title>
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<front><div type="abstract" xml:lang="en">In sturgeon aquaculture, it is advantageous to sex fish as early as possible so that males can be used for meat production and females reserved for caviar production. Currently, growers wait 3 to 4 years before fish are sexed by an invasive surgical examination of the gonads. The goal of this study was to determine when sex could be determined by examining levels of plasma steroids. Populations of white sturgeon were held at three locations and water temperatures (Oregon-13 ± 0.1 °C, Idaho-15 ± 0.1 °C and California-18 ± 0.5 °C). Blood was sampled every 3 months and plasma testosterone (T), 11-ketotestosterone (KT) and estradiol (E2) concentrations were measured by radioimmunoassay (RIA). By 18 months of age, males from California had significantly higher levels of T and KT than females. By 21 months, all males could be separated from females based on T and KT content (>2 ng/ml). However, males and females from Idaho and Oregon had similar levels of T and KT up to 36 and 34 months of age, respectively, and sex could not be delineated based on plasma sex steroid content. There were no differences in E2 levels between males and females in all populations, and at all sample periods. Histological analysis of gonads revealed that all but one of the males from California  had well differentiated testes with spermatogonia undergoing mitosis in cysts (stage 2), whereas the testes of all fish from Idaho and Oregon had just begun to differentiate (stage 1). Growth rates of fish were highest in California, intermediate in Idaho and lowest in Oregon. It appears that proliferation of spermatogonia is necessary for production of androgens and that growth rate, as influenced by water temperature, is the main contributor to the early onset of this process. This study has developed a less invasive technique for ascertaining sex in white sturgeon that can be used 1 to 2 years earlier than current methodologies.</div>
</front>
</TEI>
<affiliations><list><country><li>États-Unis</li>
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<region><li>Californie</li>
<li>Idaho</li>
<li>Oregon</li>
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<tree><country name="États-Unis"><region name="Oregon"><name sortKey="Feist, Grant" sort="Feist, Grant" uniqKey="Feist G" first="Grant" last="Feist">Grant Feist</name>
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<name sortKey="Doroshov, Serge I" sort="Doroshov, Serge I" uniqKey="Doroshov S" first="Serge I." last="Doroshov">Serge I. Doroshov</name>
<name sortKey="Fitzpatrick, Martin S" sort="Fitzpatrick, Martin S" uniqKey="Fitzpatrick M" first="Martin S." last="Fitzpatrick">Martin S. Fitzpatrick</name>
<name sortKey="Schneider, Richard P" sort="Schneider, Richard P" uniqKey="Schneider R" first="Richard P." last="Schneider">Richard P. Schneider</name>
<name sortKey="Schreck, Carl B" sort="Schreck, Carl B" uniqKey="Schreck C" first="Carl B." last="Schreck">Carl B. Schreck</name>
<name sortKey="Van Eenennaam, Joel P" sort="Van Eenennaam, Joel P" uniqKey="Van Eenennaam J" first="Joel P." last="Van Eenennaam">Joel P. Van Eenennaam</name>
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Early identification of sex in cultured white sturgeon, Acipenser transmontanus, using plasma steroid levels

Early identification of sex in cultured white sturgeon, Acipenser transmontanus, using plasma steroid levels

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri