Changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin during the first and subsequent reproductive cycles of female rainbow trout
Identifieur interne : 002229 ( Main/Merge ); précédent : 002228; suivant : 002230Changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin during the first and subsequent reproductive cycles of female rainbow trout
Auteurs : C. Whitehead [Royaume-Uni] ; N. R. Bromage [Royaume-Uni] ; B. Breton [France]Source :
- Aquaculture [ 0044-8486 ] ; 1983.
Abstract
The present study investigates the relationship between changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin (by measurement of phosphoprotein phosphorus and calcium) during the annual reproductive cycle of the female rainbow trout. Two series of experiments were conducted: the first using 2-year-old previously immature fish, and the second using 3-year-old trout which had spawned during the previous reproductive cycle. The fish were maintained throughout the experiments in light-proof aquaria under simulated normal seasonal light cycles at a constant temperature of 9°C and feeding rate of 0.5% body weight/per day.The fish in both series of experiments spawned by hand-stripping in mid-January at exactly the same time as other fish maintained in outside tanks under ambient conditions. Thus, photoperiod is confirmed as the major environmental determinant of reproduction in rainbow trout. A similar sequence of neuroendocrine changes was observed in both the first- and second-time spawning fish, thus indicating that similar pituitary-ovarian control mechanisms are in operation in all maturing fish irrespective of age.The initial endocrine event was an increase in the serum level of gonadotropin during the first stages of oocyte development. In the second series of experiments, which were begun in February, it appeared that minor alterations in both gonadotropin and oestradiol 17β levels were occurring as early as March in the annual cycle. Following these changes in gonadotropin, oestradiol 17β levels were increased to reach a maximum in the summer during the period of active exogenous vitellogenesis. After the subsequent induction of vitellogenin secretion, as evidenced by raised calcium and phosphoprotein phosphorus levels, oestradiol 17β values fell and this decrease appeared to elicit a much greater increase in gonadotropin levels at the time of final oocyte maturation, ovulation and spawning. Vitellogenin levels did not fall until spawning had occurred. The relationship of these changes to the overall control of trout reproduction is discussed.
Url:
DOI: 10.1016/0044-8486(83)90211-9
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000956
- to stream Istex, to step Curation: 000954
- to stream Istex, to step Checkpoint: 001383
Links to Exploration step
ISTEX:FF6A11373FC16CC6E04FD957660359B94733D627Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin during the first and subsequent reproductive cycles of female rainbow trout</title><author><name sortKey="Whitehead, C" sort="Whitehead, C" uniqKey="Whitehead C" first="C." last="Whitehead">C. Whitehead</name></author><author><name sortKey="Bromage, N R" sort="Bromage, N R" uniqKey="Bromage N" first="N. R." last="Bromage">N. R. Bromage</name></author><author><name sortKey="Breton, B" sort="Breton, B" uniqKey="Breton B" first="B." last="Breton">B. Breton</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:FF6A11373FC16CC6E04FD957660359B94733D627</idno><date when="1983" year="1983">1983</date><idno type="doi">10.1016/0044-8486(83)90211-9</idno><idno type="url">https://api.istex.fr/document/FF6A11373FC16CC6E04FD957660359B94733D627/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000956</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000956</idno><idno type="wicri:Area/Istex/Curation">000954</idno><idno type="wicri:Area/Istex/Checkpoint">001383</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">001383</idno><idno type="wicri:doubleKey">0044-8486:1983:Whitehead C:changes:in:serum</idno><idno type="wicri:Area/Main/Merge">002229</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin during the first and subsequent reproductive cycles of female rainbow trout</title><author><name sortKey="Whitehead, C" sort="Whitehead, C" uniqKey="Whitehead C" first="C." last="Whitehead">C. Whitehead</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Fish Culture Unit, Department of Biological Sciences, University of Aston in Birmingham, Gosta Green</wicri:regionArea><wicri:noRegion>Gosta Green</wicri:noRegion></affiliation></author><author><name sortKey="Bromage, N R" sort="Bromage, N R" uniqKey="Bromage N" first="N. R." last="Bromage">N. R. Bromage</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Fish Culture Unit, Department of Biological Sciences, University of Aston in Birmingham, Gosta Green</wicri:regionArea><wicri:noRegion>Gosta Green</wicri:noRegion></affiliation></author><author><name sortKey="Breton, B" sort="Breton, B" uniqKey="Breton B" first="B." last="Breton">B. Breton</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physiologie des Poissons, INRA, Université de Rennes, Beaulieu</wicri:regionArea><wicri:noRegion>Beaulieu</wicri:noRegion><wicri:noRegion>Beaulieu</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Aquaculture</title><title level="j" type="abbrev">AQUA</title><idno type="ISSN">0044-8486</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1983">1983</date><biblScope unit="volume">34</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="317">317</biblScope><biblScope unit="page" to="326">326</biblScope></imprint><idno type="ISSN">0044-8486</idno></series><idno type="istex">FF6A11373FC16CC6E04FD957660359B94733D627</idno><idno type="DOI">10.1016/0044-8486(83)90211-9</idno><idno type="PII">0044-8486(83)90211-9</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0044-8486</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The present study investigates the relationship between changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin (by measurement of phosphoprotein phosphorus and calcium) during the annual reproductive cycle of the female rainbow trout. Two series of experiments were conducted: the first using 2-year-old previously immature fish, and the second using 3-year-old trout which had spawned during the previous reproductive cycle. The fish were maintained throughout the experiments in light-proof aquaria under simulated normal seasonal light cycles at a constant temperature of 9°C and feeding rate of 0.5% body weight/per day.The fish in both series of experiments spawned by hand-stripping in mid-January at exactly the same time as other fish maintained in outside tanks under ambient conditions. Thus, photoperiod is confirmed as the major environmental determinant of reproduction in rainbow trout. A similar sequence of neuroendocrine changes was observed in both the first- and second-time spawning fish, thus indicating that similar pituitary-ovarian control mechanisms are in operation in all maturing fish irrespective of age.The initial endocrine event was an increase in the serum level of gonadotropin during the first stages of oocyte development. In the second series of experiments, which were begun in February, it appeared that minor alterations in both gonadotropin and oestradiol 17β levels were occurring as early as March in the annual cycle. Following these changes in gonadotropin, oestradiol 17β levels were increased to reach a maximum in the summer during the period of active exogenous vitellogenesis. After the subsequent induction of vitellogenin secretion, as evidenced by raised calcium and phosphoprotein phosphorus levels, oestradiol 17β values fell and this decrease appeared to elicit a much greater increase in gonadotropin levels at the time of final oocyte maturation, ovulation and spawning. Vitellogenin levels did not fall until spawning had occurred. The relationship of these changes to the overall control of trout reproduction is discussed.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Eau/explor/EsturgeonV1/Data/Main/Merge
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 002229 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Merge/biblio.hfd -nk 002229 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Eau
|area= EsturgeonV1
|flux= Main
|étape= Merge
|type= RBID
|clé= ISTEX:FF6A11373FC16CC6E04FD957660359B94733D627
|texte= Changes in serum levels of gonadotropin, oestradiol 17β and vitellogenin during the first and subsequent reproductive cycles of female rainbow trout
}}
| This area was generated with Dilib version V0.6.27. |  |