Reproductive conditions of the Atlantic sturgeon ( Acipenser oxyrinchus ) in the Hudson River
Identifieur interne : 001951 ( Main/Exploration ); précédent : 001950; suivant : 001952Reproductive conditions of the Atlantic sturgeon ( Acipenser oxyrinchus ) in the Hudson River
Auteurs : J. P. Van Eenennaam [États-Unis] ; S. I. Doroshov [États-Unis] ; G. P. Moberg [États-Unis] ; J. G. Watson [États-Unis] ; D. S. Moore [États-Unis] ; J. Linares [États-Unis]Source :
- Estuaries [ 0160-8347 ] ; 1996-12-01.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Estuaire, Milieu marin.
English descriptors
- KwdEn :
Abstract
Abstract: Ninety-four prespawning adult Atlantic sturgeon (Acipenser oxyrinchus) were sampled in the Hudson River for age, sex, body size, gonad weight, fecundity, mature oocyte size, and plasma concentrations of gonadotropins, sex steroids, and vitellogenin during the spring spawning migrations in 1992 and 1993. In males, the age and total length ranged from 12 yr to 19 yr and from 133 cm to 204 cm and in females from 14 yr to 36 yr and from 197 cm to 254 cm. The majority of males were 13–16 yr old, and females were 16–20 yr old. Some females had residual atretic ovarian bodies, presumably remaining from a previous spawning and indicating iteroparity. Pre-ovulatory condition was recognized by migration of the germinal vesicle or by germinal vesicle breakdown and by significantly elevated plasma gonadotropins, progesterone, and vitellogenin. All pre-ovulatory females were captured upriver from Hudson River kilometer 136. Individual fecundity ranged from 0.4 million to 2.0 million eggs and oocyte diameter from 2.4 mm to 2.9 mm, and both characters exhibited a significant (p<0.05) positive relationship with female body size. Iteroparous females, tentatively identified by the presence of atretic bodies remaining in the ovary from a previous spawning, had significantly (p<0.05) higher fecundity and produced larger eggs, compared with females spawning presumably for the first time.
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DOI: 10.2307/1352296
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Le document en format XML
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In males, the age and total length ranged from 12 yr to 19 yr and from 133 cm to 204 cm and in females from 14 yr to 36 yr and from 197 cm to 254 cm. The majority of males were 13–16 yr old, and females were 16–20 yr old. Some females had residual atretic ovarian bodies, presumably remaining from a previous spawning and indicating iteroparity. Pre-ovulatory condition was recognized by migration of the germinal vesicle or by germinal vesicle breakdown and by significantly elevated plasma gonadotropins, progesterone, and vitellogenin. All pre-ovulatory females were captured upriver from Hudson River kilometer 136. Individual fecundity ranged from 0.4 million to 2.0 million eggs and oocyte diameter from 2.4 mm to 2.9 mm, and both characters exhibited a significant (p<0.05) positive relationship with female body size. Iteroparous females, tentatively identified by the presence of atretic bodies remaining in the ovary from a previous spawning, had significantly (p<0.05) higher fecundity and produced larger eggs, compared with females spawning presumably for the first time.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Van Eenennaam, J P" sort="Van Eenennaam, J P" uniqKey="Van Eenennaam J" first="J. P." last="Van Eenennaam">J. P. Van Eenennaam</name></region><name sortKey="Doroshov, S I" sort="Doroshov, S I" uniqKey="Doroshov S" first="S. I." last="Doroshov">S. I. Doroshov</name><name sortKey="Linares, J" sort="Linares, J" uniqKey="Linares J" first="J." last="Linares">J. Linares</name><name sortKey="Moberg, G P" sort="Moberg, G P" uniqKey="Moberg G" first="G. P." last="Moberg">G. P. Moberg</name><name sortKey="Moore, D S" sort="Moore, D S" uniqKey="Moore D" first="D. S." last="Moore">D. S. Moore</name><name sortKey="Watson, J G" sort="Watson, J G" uniqKey="Watson J" first="J. G." last="Watson">J. G. Watson</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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