Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production
Identifieur interne : 001A01 ( Main/Merge ); précédent : 001A00; suivant : 001A02Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production
Auteurs : E. Gisbert [Espagne] ; P. Williot [France]Source :
- Aquaculture : (Amsterdam) [ 0044-8486 ] ; 1997.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Copyright (c) 1997 Elsevier Science B.V. All rights reserved. Behaviour of larval Siberian sturgeon and the effect of the timing of first feeding (5, 7, 9 11, 13, 15 and 17 d post hatch) of a dry commercial diet were examined at 18°C. Hatchlings (<1-day old larvae) and 1-3-day old larvae were strongly photopositive and exhibited a vertical swim-up and drift behaviour. Older 4-8-day post hatch larvae aggregated and were positively rheotactic and benthic. 9 and 10-day post hatch larvae were active swimmers and dispersed across the bottom of the tank. At this age yolk sac is depleted and exogenous feeding occurs. Feeding was positively correlated with melanin plug ejection. Availability of feed significantly affected survival, body size and specific growth rate of fish larvae (P<0.05), but no abnormal behaviour was observed as a consequence of food deprivation. Fry with the highest survival rates (76-83%), growth in weight and length (288-308 mg and 35.9-37.2 mm respectively) and specific growth rates (13.4-13.1% day-1) were those fed at days 5, 7 and 9 after hatching. Condition factor decreased dramatically from 1.39 to 0.44-0.49 during the endogenous feeding phase. However, from the beginning of the exogenous feeding to 22 days after hatching, condition factor slightly increased and achieved adult shape values (0.60-0.63). These results confirm the importance of the initial feeding time and suggest that food should be offered to sturgeon larvae at 9 d after hatching, coinciding with the disappearing of schooling behaviour, the scattering of larvae across the bottom of the tank and the apparent full resorption of yolk-sac reserves. Feeding Siberian sturgeon larvae during the phase of transition between yolk-sac nutrition to exogenous feeding (5-7 days post hatch), did not provide any advantage. Expulsion of melanin plug can not really be used to determine the time of transition to active feeding, as it appears to be a consequence of first feeding. © 1997 Elsevier Science B.V.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production</title><author><name sortKey="Gisbert, E" sort="Gisbert, E" uniqKey="Gisbert E" first="E." last="Gisbert">E. Gisbert</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1> Aquaculture Laboratory, Faculty of Biology, University of Barcelona, Av. Diagonal, 645, 08028</s1><s2>Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ></inist:fA14><country>Espagne</country><placeName><settlement type="city">Barcelone</settlement><region nuts="2" type="region">Catalogne</region></placeName></affiliation></author><author><name sortKey="Williot, P" sort="Williot, P" uniqKey="Williot P" first="P." last="Williot">P. Williot</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1> Division Aquaculture et Pêche, Groupement de Bordeaux, Cemagref, 50 avenue de Verdum, BP 3, 33611</s1><s2>Gazinet</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>Gazinet</wicri:noRegion><placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region><region type="old region" nuts="2">Aquitaine</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">98-0036039</idno><date when="1997">1997</date><idno type="stanalyst">PASCAL 98-0036039 Elsevier</idno><idno type="RBID">Pascal:98-0036039</idno><idno type="wicri:Area/PascalFrancis/Corpus">000429</idno><idno type="wicri:Area/PascalFrancis/Curation">000682</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000451</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000451</idno><idno type="wicri:doubleKey">0044-8486:1997:Gisbert E:larval:behaviour:and</idno><idno type="wicri:Area/Main/Merge">001A01</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Larval behaviour and effect of the timing of initial feeding on growth and survival of Siberian sturgeon (Acipenser laeri) larvae under small scale hatchery production</title><author><name sortKey="Gisbert, E" sort="Gisbert, E" uniqKey="Gisbert E" first="E." last="Gisbert">E. Gisbert</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1> Aquaculture Laboratory, Faculty of Biology, University of Barcelona, Av. Diagonal, 645, 08028</s1><s2>Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ></inist:fA14><country>Espagne</country><placeName><settlement type="city">Barcelone</settlement><region nuts="2" type="region">Catalogne</region></placeName></affiliation></author><author><name sortKey="Williot, P" sort="Williot, P" uniqKey="Williot P" first="P." last="Williot">P. Williot</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1> Division Aquaculture et Pêche, Groupement de Bordeaux, Cemagref, 50 avenue de Verdum, BP 3, 33611</s1><s2>Gazinet</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>Gazinet</wicri:noRegion><placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region><region type="old region" nuts="2">Aquitaine</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Aquaculture : (Amsterdam)</title><title level="j" type="abbreviated">Aquaculture : (Amst.)</title><idno type="ISSN">0044-8486</idno><imprint><date when="1997">1997</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Aquaculture : (Amsterdam)</title><title level="j" type="abbreviated">Aquaculture : (Amst.)</title><idno type="ISSN">0044-8486</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acipenser baeri</term><term>Farming animal</term><term>Feeding</term><term>Feeding behavior</term><term>Growth</term><term>Larva</term><term>Survival</term><term>Timing</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Timing</term><term>Alimentation</term><term>Comportement alimentaire</term><term>Larve</term><term>Croissance</term><term>Survie</term><term>Animal élevage</term><term>Acipenser baeri</term><term>Acipenseridae</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Copyright (c) 1997 Elsevier Science B.V. All rights reserved. Behaviour of larval Siberian sturgeon and the effect of the timing of first feeding (5, 7, 9 11, 13, 15 and 17 d post hatch) of a dry commercial diet were examined at 18°C. Hatchlings (<1-day old larvae) and 1-3-day old larvae were strongly photopositive and exhibited a vertical swim-up and drift behaviour. Older 4-8-day post hatch larvae aggregated and were positively rheotactic and benthic. 9 and 10-day post hatch larvae were active swimmers and dispersed across the bottom of the tank. At this age yolk sac is depleted and exogenous feeding occurs. Feeding was positively correlated with melanin plug ejection. Availability of feed significantly affected survival, body size and specific growth rate of fish larvae (P<0.05), but no abnormal behaviour was observed as a consequence of food deprivation. Fry with the highest survival rates (76-83%), growth in weight and length (288-308 mg and 35.9-37.2 mm respectively) and specific growth rates (13.4-13.1% day<sup>-1</sup>) were those fed at days 5, 7 and 9 after hatching. Condition factor decreased dramatically from 1.39 to 0.44-0.49 during the endogenous feeding phase. However, from the beginning of the exogenous feeding to 22 days after hatching, condition factor slightly increased and achieved adult shape values (0.60-0.63). These results confirm the importance of the initial feeding time and suggest that food should be offered to sturgeon larvae at 9 d after hatching, coinciding with the disappearing of schooling behaviour, the scattering of larvae across the bottom of the tank and the apparent full resorption of yolk-sac reserves. Feeding Siberian sturgeon larvae during the phase of transition between yolk-sac nutrition to exogenous feeding (5-7 days post hatch), did not provide any advantage. Expulsion of melanin plug can not really be used to determine the time of transition to active feeding, as it appears to be a consequence of first feeding. © 1997 Elsevier Science B.V.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>France</li></country><region><li>Aquitaine</li><li>Catalogne</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Barcelone</li></settlement></list><tree><country name="Espagne"><region name="Catalogne"><name sortKey="Gisbert, E" sort="Gisbert, E" uniqKey="Gisbert E" first="E." last="Gisbert">E. Gisbert</name></region></country><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Williot, P" sort="Williot, P" uniqKey="Williot P" first="P." last="Williot">P. Williot</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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