Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths
Identifieur interne : 001014 ( Istex/Corpus ); précédent : 001013; suivant : 001015Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths
Auteurs : Lucinda Rodr Guez ; Ideal Begtashi ; Silvia Zanuy ; M Nica Shaw ; Manuel CarrilloSource :
- Aquaculture [ 0044-8486 ] ; 2001.
Abstract
Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (Dicentrarchus labrax L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.
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DOI: 10.1016/S0044-8486(01)00774-8
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths</title><author><name sortKey="Rodr Guez, Lucinda" sort="Rodr Guez, Lucinda" uniqKey="Rodr Guez L" first="Lucinda" last="Rodr Guez">Lucinda Rodr Guez</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation></author><author><name sortKey="Begtashi, Ideal" sort="Begtashi, Ideal" uniqKey="Begtashi I" first="Ideal" last="Begtashi">Ideal Begtashi</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation></author><author><name sortKey="Zanuy, Silvia" sort="Zanuy, Silvia" uniqKey="Zanuy S" first="Silvia" last="Zanuy">Silvia Zanuy</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation></author><author><name sortKey="Shaw, M Nica" sort="Shaw, M Nica" uniqKey="Shaw M" first="M Nica" last="Shaw">M Nica Shaw</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation></author><author><name sortKey="Carrillo, Manuel" sort="Carrillo, Manuel" uniqKey="Carrillo M" first="Manuel" last="Carrillo">Manuel Carrillo</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, 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M" first="M Nica" last="Shaw">M Nica Shaw</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation></author><author><name sortKey="Carrillo, Manuel" sort="Carrillo, Manuel" uniqKey="Carrillo M" first="Manuel" last="Carrillo">Manuel Carrillo</name><affiliation><mods:affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: carrillo@iats.csic.es</mods:affiliation></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="2001">2001</date><biblScope unit="volume">202</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="235">235</biblScope><biblScope unit="page" to="248">248</biblScope></imprint><idno type="ISSN">0044-8486</idno></series><idno type="istex">EAD3DD39EBD4340D1774A862250BB6DC83D16BC0</idno><idno type="DOI">10.1016/S0044-8486(01)00774-8</idno><idno type="PII">S0044-8486(01)00774-8</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">Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (Dicentrarchus labrax L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Lucinda Rodrı́guez</name><affiliations><json:string>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</json:string></affiliations></json:item><json:item><name>Ideal Begtashi</name><affiliations><json:string>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</json:string></affiliations></json:item><json:item><name>Silvia Zanuy</name><affiliations><json:string>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</json:string></affiliations></json:item><json:item><name>Mónica Shaw</name><affiliations><json:string>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</json:string></affiliations></json:item><json:item><name>Manuel Carrillo</name><affiliations><json:string>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</json:string><json:string>E-mail: carrillo@iats.csic.es</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Gonadotropin</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Sexual steroids</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Puberty</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Photoperiod</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Sea bass</value></json:item></subject><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (Dicentrarchus labrax L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.</abstract><qualityIndicators><score>7.522</score><pdfVersion>1.2</pdfVersion><pdfPageSize>435 x 643 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>5</keywordCount><abstractCharCount>2067</abstractCharCount><pdfWordCount>4522</pdfWordCount><pdfCharCount>26868</pdfCharCount><pdfPageCount>14</pdfPageCount><abstractWordCount>310</abstractWordCount></qualityIndicators><title>Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths</title><pii><json:string>S0044-8486(01)00774-8</json:string></pii><genre><json:string>research-article</json:string></genre><serie><volume>vol. IV</volume><pages><last>65</last><first>55</first></pages><language><json:string>unknown</json:string></language><title>Recent Advances in Aquaculture</title></serie><host><volume>202</volume><pii><json:string>S0044-8486(00)X0140-8</json:string></pii><editor><json:item><name>M. 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The horizontal grey bars indicate the time when spermiation took place in each treatment. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months).</note><note type="content">Fig. 2: Percentage of spermiating males (black bars) and gonadosomatic index (GSI; dotted lines) for male sea bass of Experiment I (A) and Experiment II (B) during the first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 3: Plasma GTH-2 levels in male sea bass during the first sexual maturation. (A) Experiment I: natural photoperiod (NP1) and expanded photoperiod (EX, 18 months); (B) Experiment II: natural photoperiod (NP2) and compressed photoperiod (CO, 6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 4: Plasma testosterone (left graphs) and 11-ketotestosterone (right graphs) levels for male sea bass of Experiment I (A) and Experiment II (B) during first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 5: Relation between 11-ketotestosterone (11-KT) and testosterone (T) levels for male sea bass of Experiment I (A) and Experiment II (B) during first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths</title><author xml:id="author-1"><persName><forename type="first">Lucinda</forename><surname>Rodrı́guez</surname></persName><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation></author><author xml:id="author-2"><persName><forename type="first">Ideal</forename><surname>Begtashi</surname></persName><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation></author><author xml:id="author-3"><persName><forename type="first">Silvia</forename><surname>Zanuy</surname></persName><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation></author><author xml:id="author-4"><persName><forename type="first">Mónica</forename><surname>Shaw</surname></persName><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation></author><author xml:id="author-5"><persName><forename type="first">Manuel</forename><surname>Carrillo</surname></persName><email>carrillo@iats.csic.es</email><note type="correspondence"><p>Corresponding author. Tel.: +34-64-319-500; fax: +34-64-319-509</p></note><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation></author></analytic><monogr><title level="j">Aquaculture</title><title level="j" type="abbrev">AQUA</title><idno type="pISSN">0044-8486</idno><idno type="PII">S0044-8486(00)X0140-8</idno><meeting><addName>Bass SPP culture:basic and applied aspects, Nice, France</addName><date>20000502</date></meeting><editor><persName>M. Carrillo</persName></editor><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001"></date><biblScope unit="volume">202</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="235">235</biblScope><biblScope unit="page" to="248">248</biblScope></imprint></monogr><idno type="istex">EAD3DD39EBD4340D1774A862250BB6DC83D16BC0</idno><idno type="DOI">10.1016/S0044-8486(01)00774-8</idno><idno type="PII">S0044-8486(01)00774-8</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2001</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (Dicentrarchus labrax L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>Gonadotropin</term></item><item><term>Sexual steroids</term></item><item><term>Puberty</term></item><item><term>Photoperiod</term></item><item><term>Sea bass</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2001">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/EAD3DD39EBD4340D1774A862250BB6DC83D16BC0/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: ce:floats; body; tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"><istex:entity SYSTEM="gr1" NDATA="IMAGE" name="gr1"></istex:entity><istex:entity SYSTEM="gr2" NDATA="IMAGE" name="gr2"></istex:entity><istex:entity SYSTEM="gr3" NDATA="IMAGE" name="gr3"></istex:entity><istex:entity SYSTEM="gr4" NDATA="IMAGE" name="gr4"></istex:entity><istex:entity SYSTEM="gr5" NDATA="IMAGE" name="gr5"></istex:entity></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>AQUA</jid><aid>61774</aid><ce:pii>S0044-8486(01)00774-8</ce:pii><ce:doi>10.1016/S0044-8486(01)00774-8</ce:doi><ce:copyright type="full-transfer" year="2001">Elsevier Science B.V.</ce:copyright></item-info><head><ce:title>Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass (<ce:italic>Dicentrarchus labrax</ce:italic> L.) under artificial day lengths</ce:title><ce:author-group><ce:author><ce:indexed-name>Rodriguez</ce:indexed-name><ce:given-name>Lucinda</ce:given-name><ce:surname>Rodrı́guez</ce:surname></ce:author><ce:author><ce:given-name>Ideal</ce:given-name><ce:surname>Begtashi</ce:surname></ce:author><ce:author><ce:given-name>Silvia</ce:given-name><ce:surname>Zanuy</ce:surname></ce:author><ce:author><ce:given-name>Mónica</ce:given-name><ce:surname>Shaw</ce:surname></ce:author><ce:author><ce:given-name>Manuel</ce:given-name><ce:surname>Carrillo</ce:surname><ce:cross-ref refid="COR1">*</ce:cross-ref><ce:e-address>carrillo@iats.csic.es</ce:e-address></ce:author><ce:affiliation><ce:textfn>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</ce:textfn></ce:affiliation><ce:correspondence id="COR1"><ce:label>*</ce:label><ce:text>Corresponding author. Tel.: +34-64-319-500; fax: +34-64-319-509</ce:text></ce:correspondence></ce:author-group><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (<ce:italic>Dicentrarchus labrax</ce:italic> L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords class="keyword"><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>Gonadotropin</ce:text></ce:keyword><ce:keyword><ce:text>Sexual steroids</ce:text></ce:keyword><ce:keyword><ce:text>Puberty</ce:text></ce:keyword><ce:keyword><ce:text>Photoperiod</ce:text></ce:keyword><ce:keyword><ce:text>Sea bass</ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass ( Dicentrarchus labrax L.) under artificial day lengths</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Changes in plasma levels of reproductive hormones during first sexual maturation in European male sea bass (</title></titleInfo><name type="personal"><namePart type="given">Lucinda</namePart><namePart type="family">Rodrı́guez</namePart><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ideal</namePart><namePart type="family">Begtashi</namePart><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Silvia</namePart><namePart type="family">Zanuy</namePart><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Mónica</namePart><namePart type="family">Shaw</namePart><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Manuel</namePart><namePart type="family">Carrillo</namePart><affiliation>Consejo Superior de Investigaciones Cientı́ficas (CSIC), Instituto de Acuicultura de Torre la Sal, 12595 Ribera de Cabanes, Castellón, Spain</affiliation><affiliation>E-mail: carrillo@iats.csic.es</affiliation><description>Corresponding author. Tel.: +34-64-319-500; fax: +34-64-319-509</description><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">2001</dateIssued><copyrightDate encoding="w3cdtf">2001</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Photoperiod has been considered one of the most important factors triggering puberty, as well as reproduction, in several fish species, including sea bass (Dicentrarchus labrax L.). In the present work, the effect of expanded (EX) and compressed (CO) photoperiods on plasma levels of reproductive hormones (gonadotropin-2 (GTH-2), testosterone (T) and 11-ketotestosterone (11-KT)) and gonadal maturation (spermiation time and gonadosomatic index (GSI)) were investigated in male sea bass during the first sexual maturation (October to April). Spermiation in controls was apparent from December to February–March. In EX and CO groups, spermiation was advanced by 2 months, although the CO group displayed a bimodal pattern, and testicular growth in both experimental groups was significantly reduced with respect to the controls. Plasma GTH-2 levels in controls showed the highest value (∼30 ng/ml) in the middle of the spermiation period, while EX group displayed the maximum level 4 months earlier (35±2.7 ng/ml) than controls. The CO group presented two peaks, the first of which (15.16±5.20 ng/ml) was advanced by 3 months with respect to the control peak. T and 11-KT levels in the control displayed the highest values during the spermiation period. The EX group showed lower T levels than controls, but both peaked at the same time. However, 11-KT levels remained low and unchanged. The CO group displayed two significant increases in T levels accordingly with the spermiation pattern, while the 11-KT profile only exhibited a significant increase 2 months earlier than in controls. Results obtained indicated an involvement of GTH-2 in gonadal maturation. In addition, T is suggested to be involved in the activation of the brain–pituitary–gonad (BPG) axis during pubertal development, while 11-KT may act by stimulating spermatogenesis and/or spermiation in juvenile male sea bass. Furthermore, the profiles of these reproductive hormones were altered by both expanded and compressed photoperiods, and first sexual maturation was advanced by at least 2 months.</abstract><note type="content">Fig. 1: Experimental design of the temperature cycle and photoperiod regimes used. The horizontal grey bars indicate the time when spermiation took place in each treatment. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months).</note><note type="content">Fig. 2: Percentage of spermiating males (black bars) and gonadosomatic index (GSI; dotted lines) for male sea bass of Experiment I (A) and Experiment II (B) during the first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 3: Plasma GTH-2 levels in male sea bass during the first sexual maturation. (A) Experiment I: natural photoperiod (NP1) and expanded photoperiod (EX, 18 months); (B) Experiment II: natural photoperiod (NP2) and compressed photoperiod (CO, 6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 4: Plasma testosterone (left graphs) and 11-ketotestosterone (right graphs) levels for male sea bass of Experiment I (A) and Experiment II (B) during first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><note type="content">Fig. 5: Relation between 11-ketotestosterone (11-KT) and testosterone (T) levels for male sea bass of Experiment I (A) and Experiment II (B) during first sexual maturation. NP1 and NP2=natural photoperiods for Experiments I and II, respectively; EX=expanded photoperiod (18 months); CO=compressed photoperiod (6 months). Horizontal bars on the X-axis represents the spermiation period for NP1 and NP2 groups (grey bars) and EX and CO groups (dark grey bars). Different letters indicate significant differences (P<0.05). Lower case letters indicate differences between months in the same group and upper case letters indicate differences between groups in the same month.</note><subject><genre>Keywords</genre><topic>Gonadotropin</topic><topic>Sexual steroids</topic><topic>Puberty</topic><topic>Photoperiod</topic><topic>Sea bass</topic></subject><relatedItem type="host"><titleInfo><title>Aquaculture</title></titleInfo><titleInfo type="abbreviated"><title>AQUA</title></titleInfo><name type="conference"><namePart>Bass SPP culture:basic and applied aspects, Nice, France</namePart><namePart type="date">20000502</namePart></name><name type="personal"><namePart>M. Carrillo</namePart><role><roleTerm type="text">editor</roleTerm></role></name><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">20011101</dateIssued></originInfo><identifier type="ISSN">0044-8486</identifier><identifier type="PII">S0044-8486(00)X0140-8</identifier><part><date>20011101</date><detail type="issue"><title>Bass SPP culture:basic and applied aspects, Nice, France</title></detail><detail type="volume"><number>202</number><caption>vol.</caption></detail><detail type="issue"><number>3–4</number><caption>no.</caption></detail><extent unit="issue pages"><start>185</start><end>392</end></extent><extent unit="pages"><start>235</start><end>248</end></extent></part></relatedItem><identifier type="istex">EAD3DD39EBD4340D1774A862250BB6DC83D16BC0</identifier><identifier type="DOI">10.1016/S0044-8486(01)00774-8</identifier><identifier type="PII">S0044-8486(01)00774-8</identifier><accessCondition type="use and reproduction" contentType="copyright">©2001 Elsevier Science B.V.</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>Elsevier Science B.V., ©2001</recordOrigin></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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