Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing
Identifieur interne : 001418 ( Istex/Corpus ); précédent : 001417; suivant : 001419Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing
Auteurs : Terje Van Der Meeren ; Vladimir P. IvannikovSource :
- Aquaculture Research [ 1355-557X ] ; 2006-06.
English descriptors
- KwdEn :
Abstract
Commercial intensive fry production of Atlantic cod will be dependent on production of viable eggs independent of season. This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. Specific growth rates (8.3–13.6% day−1) is comparable with other intensive rearing trials with cod, but were lower than reported from nature‐like systems.
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DOI: 10.1111/j.1365-2109.2006.01510.x
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ISTEX:67A1E9B6BAB4DC5743B9EE0CCC5E86D42C87AE27Le document en format XML
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This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. Specific growth rates (8.3–13.6% day−1) is comparable with other intensive rearing trials with cod, but were lower than reported from nature‐like systems.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Terje Van Der Meeren</name><affiliations><json:string>Institute of Marine Research, Austevoll, Storebø, Norway</json:string></affiliations></json:item><json:item><name>Vladimir P Ivannikov</name><affiliations><json:string>Cod Culture Norway AS, Rong, Norway</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Atlantic cod</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Gadus morhua</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>fecundity</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>spawning</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>egg viability temperature effects</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>fertilization</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>abnormal egg development</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>intensive larval rearing</value></json:item></subject><articleId><json:string>ARE1510</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>Commercial intensive fry production of Atlantic cod will be dependent on production of viable eggs independent of season. This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. 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This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. 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E‐mail: <email normalForm="Terje.van.der.Meeren@imr.no">Terje.van.der.Meeren@imr.no</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:ARE.ARE1510.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="5"></count><count type="tableTotal" number="4"></count><count type="formulaTotal" number="2"></count><count type="referenceTotal" number="68"></count><count type="wordTotal" number="10670"></count><count type="linksCrossRef" number="103"></count></countGroup><titleGroup><title type="main">Seasonal shift in spawning of Atlantic cod (<i>Gadus morhua</i> L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing</title><title type="shortAuthors">T van der Meeren & V P Ivannikov</title><title type="short">Seasonal shift in spawning of Atlantic cod</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>Terje</givenNames><familyName>Van Der Meeren</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Vladimir P</givenNames><familyName>Ivannikov</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="NO"><unparsedAffiliation>Institute of Marine Research, Austevoll, Storebø, Norway</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="NO"><unparsedAffiliation>Cod Culture Norway AS, Rong, Norway</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">Atlantic cod</keyword><keyword xml:id="k2"><i>Gadus morhua</i></keyword><keyword xml:id="k3">fecundity</keyword><keyword xml:id="k4">photoperiod</keyword><keyword xml:id="k5">spawning</keyword><keyword xml:id="k6">egg viability temperature effects</keyword><keyword xml:id="k7">fertilization</keyword><keyword xml:id="k8">abnormal egg development</keyword><keyword xml:id="k9">intensive larval rearing</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>Commercial intensive fry production of Atlantic cod will be dependent on production of viable eggs independent of season. This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. Specific growth rates (8.3–13.6% day<sup>−1</sup>) is comparable with other intensive rearing trials with cod, but were lower than reported from nature‐like systems.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Seasonal shift in spawning of Atlantic cod</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing</title></titleInfo><name type="personal"><namePart type="given">Terje</namePart><namePart type="family">Van Der Meeren</namePart><affiliation>Institute of Marine Research, Austevoll, Storebø, Norway</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Vladimir P</namePart><namePart type="family">Ivannikov</namePart><affiliation>Cod Culture Norway AS, Rong, Norway</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">2006-06</dateIssued><copyrightDate encoding="w3cdtf">2006</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">5</extent><extent unit="tables">4</extent><extent unit="formulas">2</extent><extent unit="references">68</extent><extent unit="words">10670</extent></physicalDescription><abstract lang="en">Commercial intensive fry production of Atlantic cod will be dependent on production of viable eggs independent of season. This can only be done by manipulation of maturation by photoperiod, but little is known about potential effects on egg characteristics and larval viability. In two cod broodstocks, maturation was successfully advanced or delayed 6 months compared with normal spawning season (March–April) by manipulation of photoperiod. The advanced broodstock spawned both in spring and autumn the same year. In two of the spawning tanks during autumn, ambient temperature was reduced after reaching 13.7°C during the first half of the spawning period. Egg quality and viability were monitored, and several egg batches were incubated, hatched and start‐fed for examination of growth and survival. Temperatures above 9.6°C resulted in significant reductions in fertilization and normal egg development. Concurrently, fractions of dead and unfertilized eggs increased with elevated temperature. Actual relative fecundity was not affected by temperature. Egg characteristics improved when temperature was controlled and lowered below 9.6°C. Occurrence of irregular spawners suggests that handling of broodstock fish should be avoided during maturation and spawning. Cod larvae originating from eggs of the advanced or delayed broodstocks were successfully reared beyond metamorphosis. Survival was 9.0–46.6% and 29.3% in green and clear water respectively. Survival correlated with both initial and average feeding conditions, but growth rate did not correlate with either of survival and feeding conditions. Specific growth rates (8.3–13.6% day−1) is comparable with other intensive rearing trials with cod, but were lower than reported from nature‐like systems.</abstract><subject lang="en"><genre>keywords</genre><topic>Atlantic cod</topic><topic>Gadus morhua</topic><topic>fecundity</topic><topic>photoperiod</topic><topic>spawning</topic><topic>egg viability temperature effects</topic><topic>fertilization</topic><topic>abnormal egg development</topic><topic>intensive larval rearing</topic></subject><relatedItem type="host"><titleInfo><title>Aquaculture Research</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1355-557X</identifier><identifier type="eISSN">1365-2109</identifier><identifier type="DOI">10.1111/(ISSN)1365-2109</identifier><identifier type="PublisherID">ARE</identifier><part><date>2006</date><detail type="volume"><caption>vol.</caption><number>37</number></detail><detail type="issue"><caption>no.</caption><number>9</number></detail><extent unit="pages"><start>898</start><end>913</end><total>16</total></extent></part></relatedItem><identifier type="istex">67A1E9B6BAB4DC5743B9EE0CCC5E86D42C87AE27</identifier><identifier type="DOI">10.1111/j.1365-2109.2006.01510.x</identifier><identifier type="ArticleID">ARE1510</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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