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 : 001416 ( Istex/Curation ); précédent : 001415; suivant : 001417Seasonal 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 [Norvège] ; Vladimir P. Ivannikov [Norvège]Source :
- Aquaculture Research [ 1355-557X ] ; 2006-06.
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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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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing</title><author><name sortKey="Van Der Meeren, Terje" sort="Van Der Meeren, Terje" uniqKey="Van Der Meeren T" first="Terje" last="Van Der Meeren">Terje Van Der Meeren</name><affiliation wicri:level="1"><mods:affiliation>Institute of Marine Research, Austevoll, Storebø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institute of Marine Research, Austevoll, Storebø</wicri:regionArea></affiliation></author><author><name sortKey="Ivannikov, Vladimir P" sort="Ivannikov, Vladimir P" uniqKey="Ivannikov V" first="Vladimir P" last="Ivannikov">Vladimir P. Ivannikov</name><affiliation wicri:level="1"><mods:affiliation>Cod Culture Norway AS, Rong, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Cod Culture Norway AS, Rong</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:67A1E9B6BAB4DC5743B9EE0CCC5E86D42C87AE27</idno><date when="2006" year="2006">2006</date><idno type="doi">10.1111/j.1365-2109.2006.01510.x</idno><idno type="url">https://api.istex.fr/document/67A1E9B6BAB4DC5743B9EE0CCC5E86D42C87AE27/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001418</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001418</idno><idno type="wicri:Area/Istex/Curation">001416</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Seasonal shift in spawning of Atlantic cod (Gadus morhua L.) by photoperiod manipulation: egg quality in relation to temperature and intensive larval rearing</title><author><name sortKey="Van Der Meeren, Terje" sort="Van Der Meeren, Terje" uniqKey="Van Der Meeren T" first="Terje" last="Van Der Meeren">Terje Van Der Meeren</name><affiliation wicri:level="1"><mods:affiliation>Institute of Marine Research, Austevoll, Storebø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institute of Marine Research, Austevoll, Storebø</wicri:regionArea></affiliation></author><author><name sortKey="Ivannikov, Vladimir P" sort="Ivannikov, Vladimir P" uniqKey="Ivannikov V" first="Vladimir P" last="Ivannikov">Vladimir P. Ivannikov</name><affiliation wicri:level="1"><mods:affiliation>Cod Culture Norway AS, Rong, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Cod Culture Norway AS, Rong</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Aquaculture Research</title><idno type="ISSN">1355-557X</idno><idno type="eISSN">1365-2109</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2006-06">2006-06</date><biblScope unit="volume">37</biblScope><biblScope unit="issue">9</biblScope><biblScope unit="page" from="898">898</biblScope><biblScope unit="page" to="913">913</biblScope></imprint><idno type="ISSN">1355-557X</idno></series><idno type="istex">67A1E9B6BAB4DC5743B9EE0CCC5E86D42C87AE27</idno><idno type="DOI">10.1111/j.1365-2109.2006.01510.x</idno><idno type="ArticleID">ARE1510</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1355-557X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Atlantic cod</term><term>Gadus morhua</term><term>abnormal egg development</term><term>egg viability temperature effects</term><term>fecundity</term><term>fertilization</term><term>intensive larval rearing</term><term>photoperiod</term><term>spawning</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml: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.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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