Using drift nets to capture early life stages and monitor spawning of the Yangtze River Chinese sturgeon (Acipenser sinensis)
Identifieur interne : 001144 ( Istex/Corpus ); précédent : 001143; suivant : 001145Using drift nets to capture early life stages and monitor spawning of the Yangtze River Chinese sturgeon (Acipenser sinensis)
Auteurs : Q. W. Wei ; B. Kynard ; D. G. Yang ; X. H. Chen ; H. Du ; L. Shen ; H. ZhangSource :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2009-10.
Abstract
A sampling system for capturing sturgeon eggs using a D‐shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, Acipenser sinensis, and monitor annual spawning success at Yichang on the Yangtze River, 1996–2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population.
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DOI: 10.1111/j.1439-0426.2009.01269.x
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W." last="Wei">Q. W. Wei</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</mods:affiliation></affiliation></author><author><name sortKey="Kynard, B" sort="Kynard, B" uniqKey="Kynard B" first="B." last="Kynard">B. Kynard</name><affiliation><mods:affiliation>U.S. Geological Survey, Leetown Science Center, S. O. Conte Anadromous Fish Research Center, Turners Falls, MA, USA</mods:affiliation></affiliation></author><author><name sortKey="Yang, D G" sort="Yang, D G" uniqKey="Yang D" first="D. G." last="Yang">D. G. Yang</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</mods:affiliation></affiliation></author><author><name sortKey="Chen, X H" sort="Chen, X H" uniqKey="Chen X" first="X. H." last="Chen">X. H. Chen</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</mods:affiliation></affiliation></author><author><name sortKey="Du, H" sort="Du, H" uniqKey="Du H" first="H." last="Du">H. Du</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</mods:affiliation></affiliation></author><author><name sortKey="Shen, L" sort="Shen, L" uniqKey="Shen L" first="L." last="Shen">L. Shen</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation><affiliation><mods:affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</mods:affiliation></affiliation></author><author><name sortKey="Zhang, H" sort="Zhang, H" uniqKey="Zhang H" first="H." last="Zhang">H. Zhang</name><affiliation><mods:affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Applied Ichthyology</title><idno type="ISSN">0175-8659</idno><idno type="eISSN">1439-0426</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-10">2009-10</date><biblScope unit="volume">25</biblScope><biblScope unit="supplement">s2</biblScope><biblScope unit="page" from="100">100</biblScope><biblScope unit="page" to="106">106</biblScope></imprint><idno type="ISSN">0175-8659</idno></series><idno type="istex">E91D4F2950D59AFB9F1DA4F50F6B40DD9C8A09C8</idno><idno type="DOI">10.1111/j.1439-0426.2009.01269.x</idno><idno type="ArticleID">JAI1269</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0175-8659</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A sampling system for capturing sturgeon eggs using a D‐shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, Acipenser sinensis, and monitor annual spawning success at Yichang on the Yangtze River, 1996–2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Q. W. Wei</name><affiliations><json:string>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</json:string><json:string>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</json:string><json:string>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</json:string></affiliations></json:item><json:item><name>B. Kynard</name><affiliations><json:string>U.S. Geological Survey, Leetown Science Center, S. O. 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Chen</name><affiliations><json:string>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</json:string><json:string>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</json:string></affiliations></json:item><json:item><name>H. Du</name><affiliations><json:string>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</json:string><json:string>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</json:string></affiliations></json:item><json:item><name>L. 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Zhang</name><affiliations><json:string>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</json:string></affiliations></json:item></author><articleId><json:string>JAI1269</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>A sampling system for capturing sturgeon eggs using a D‐shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, Acipenser sinensis, and monitor annual spawning success at Yichang on the Yangtze River, 1996–2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. 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W.</forename><surname>Wei</surname></persName><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation></author><author xml:id="author-2"><persName><forename type="first">B.</forename><surname>Kynard</surname></persName><affiliation>U.S. Geological Survey, Leetown Science Center, S. O. Conte Anadromous Fish Research Center, Turners Falls, MA, USA</affiliation></author><author xml:id="author-3"><persName><forename type="first">D. G.</forename><surname>Yang</surname></persName><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation></author><author xml:id="author-4"><persName><forename type="first">X. 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Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population.</p></abstract></profileDesc><revisionDesc><change when="2009-10">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/E91D4F2950D59AFB9F1DA4F50F6B40DD9C8A09C8/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1439-0426</doi><issn type="print">0175-8659</issn><issn type="electronic">1439-0426</issn><idGroup><id type="product" value="JAI"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="JOURNAL OF APPLIED ICHTHYOLOGY">Journal of Applied Ichthyology</title></titleGroup></publicationMeta><publicationMeta level="part" position="10000"><doi origin="wiley">10.1111/jai.2009.25.issue-s2</doi><titleGroup><title type="specialIssueTitle">Proceedings of the Inaugural Meeting of the North American Chapter of the World Sturgeon Conservation Society, Ottawa, Canada, August 19‐21, 2008</title></titleGroup><numberingGroup><numbering type="journalVolume" number="25">25</numbering><numbering type="supplement">s2</numbering></numberingGroup><coverDate startDate="2009-10">October 2009</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="17" status="forIssue"><doi origin="wiley">10.1111/j.1439-0426.2009.01269.x</doi><idGroup><id type="unit" value="JAI1269"></id></idGroup><countGroup><count type="pageTotal" number="7"></count></countGroup><titleGroup><title type="tocHeading1">Original Articles</title></titleGroup><copyright>© 2009 The Authors. Journal compilation © 2009 Blackwell Verlag GmbH</copyright><eventGroup><event type="firstOnline" date="2009-09-01"></event><event type="publishedOnlineFinalForm" date="2009-09-01"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:FullText result:FullText" date="2010-03-15"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-28"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-23"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="100">100</numbering><numbering type="pageLast" number="106">106</numbering></numberingGroup><correspondenceTo><b>Author’s address:</b> Qi‐Wei Wei, Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, No. 41 Jianghan Road, Shashi District, Jingzhou City, Hubei Province 434000, China.
E‐mail: <email>weiqw@yfi.ac.cn</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:JAI.JAI1269.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received: September 19, 2008 Accepted: December 30, 2008</unparsedEditorialHistory><countGroup><count type="figureTotal" number="6"></count><count type="tableTotal" number="1"></count></countGroup><titleGroup><title type="main">Using drift nets to capture early life stages and monitor spawning of the Yangtze River Chinese sturgeon (<i>Acipenser sinensis</i>)</title><title type="shortAuthors">Q. W. Wei et al.</title><title type="short">Using drift nets to monitor sturgeon spawning</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a2 #a3"><personName><givenNames>Q. W.</givenNames><familyName>Wei</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a4"><personName><givenNames>B.</givenNames><familyName>Kynard</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a1 #a2 #a3"><personName><givenNames>D. G.</givenNames><familyName>Yang</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1 #a3"><personName><givenNames>X. H.</givenNames><familyName>Chen</familyName></personName></creator><creator creatorRole="author" xml:id="cr5" affiliationRef="#a1 #a3"><personName><givenNames>H.</givenNames><familyName>Du</familyName></personName></creator><creator creatorRole="author" xml:id="cr6" affiliationRef="#a1 #a3"><personName><givenNames>L.</givenNames><familyName>Shen</familyName></personName></creator><creator creatorRole="author" xml:id="cr7" affiliationRef="#a1"><personName><givenNames>H.</givenNames><familyName>Zhang</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="CN"><unparsedAffiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="CN"><unparsedAffiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="CN"><unparsedAffiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</unparsedAffiliation></affiliation><affiliation xml:id="a4" countryCode="US"><unparsedAffiliation>U.S. Geological Survey, Leetown Science Center, S. O. Conte Anadromous Fish Research Center, Turners Falls, MA, USA</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Summary</title><p>A sampling system for capturing sturgeon eggs using a D‐shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, <i>Acipenser sinensis</i>, and monitor annual spawning success at Yichang on the Yangtze River, 1996–2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Using drift nets to capture early life stages and monitor spawning of the Yangtze River Chinese sturgeon (Acipenser sinensis)</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Using drift nets to monitor sturgeon spawning</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Using drift nets to capture early life stages and monitor spawning of the Yangtze River Chinese sturgeon (Acipenser sinensis)</title></titleInfo><name type="personal"><namePart type="given">Q. W.</namePart><namePart type="family">Wei</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">B.</namePart><namePart type="family">Kynard</namePart><affiliation>U.S. Geological Survey, Leetown Science Center, S. O. Conte Anadromous Fish Research Center, Turners Falls, MA, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. G.</namePart><namePart type="family">Yang</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">X. H.</namePart><namePart type="family">Chen</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Du</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">L.</namePart><namePart type="family">Shen</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><affiliation>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi City, Jiangsu Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Zhang</namePart><affiliation>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou City, Hubei Province, China</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2009-10</dateIssued><edition>Received: September 19, 2008 Accepted: December 30, 2008</edition><copyrightDate encoding="w3cdtf">2009</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">6</extent><extent unit="tables">1</extent></physicalDescription><abstract lang="en">A sampling system for capturing sturgeon eggs using a D‐shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, Acipenser sinensis, and monitor annual spawning success at Yichang on the Yangtze River, 1996–2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk‐sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk‐sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk‐sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back‐calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October–10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996–2002, the percentage of fertilized eggs in an annual 20‐egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population.</abstract><relatedItem type="host"><titleInfo><title>Journal of Applied Ichthyology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0175-8659</identifier><identifier type="eISSN">1439-0426</identifier><identifier type="DOI">10.1111/(ISSN)1439-0426</identifier><identifier type="PublisherID">JAI</identifier><part><date>2009</date><detail type="title"><title>Proceedings of the Inaugural Meeting of the North American Chapter of the World Sturgeon Conservation Society, Ottawa, Canada, August 19‐21, 2008</title></detail><detail type="volume"><caption>vol.</caption><number>25</number></detail><detail type="supplement"><caption>Suppl. no.</caption><number>s2</number></detail><extent unit="pages"><start>100</start><end>106</end><total>7</total></extent></part></relatedItem><identifier type="istex">E91D4F2950D59AFB9F1DA4F50F6B40DD9C8A09C8</identifier><identifier type="DOI">10.1111/j.1439-0426.2009.01269.x</identifier><identifier type="ArticleID">JAI1269</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2009 The Authors. 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