Behavioural modifications in the early life stages of Siberian sturgeon (Acipenser baerii, Brandt)
Identifieur interne : 001793 ( Main/Merge ); précédent : 001792; suivant : 001794Behavioural modifications in the early life stages of Siberian sturgeon (Acipenser baerii, Brandt)
Auteurs : Enric Gisbert [Espagne] ; Patrick Williot [France] ; F. Castell Rvay [Espagne]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 1999-09.
Abstract
Behavioural modifications of Acipenser baeri were studied during early ontogeny at 18 °C by means of specific tests and general observations. During A. baeri ontogeny, several different periods could be clearly distinguished by behavioural patterns. From hatching to 3 days post hatch (p.h.), specimens exhibited swimming‐up and drift behaviour. A transition from a pelagic to benthic behaviour occurred between 4–5 days p.h. and specimens were positively rheotactic. At 7–8 days p.h., prelarvae aggregated into schools of different shapes. During prelarval development, specimens were positively phototactic, preferred white bottoms and did not show any preference for bottom concealment. Between 9–10 days p.h. coinciding with the onset of the exogenous feeding, larvae were active bottom swimmers, schooling behaviour disappeared and larvae dispersed. During early ontogeny, changes in body coloration were observed among those specimens who swam over bottoms of different brightness and during the day/night cycle. From 9 to 12 days p.h., larvae were positively phototactic, denied bottom cover and showed preference for white substrates. At 13 days p.h., the percentage of fish exhibiting positive phototactism, preferring open to concealed bottom habitats and white bottoms started to decrease, while at 20 days p.h. specimens showed a clear preference for bottom concealment and black and greyish bottoms. The significance, use and evolution of the former behavioural patterns is deeply discussed.
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DOI: 10.1111/j.1439-0426.1999.tb00242.x
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Castell Rvay</name><affiliation wicri:level="3"><country xml:lang="fr">Espagne</country><wicri:regionArea>Laboratory of Aquaculture, Department of Animal Biology, Faculty of Biology, University of Barcelona, Barcelona</wicri:regionArea><placeName><settlement type="city">Barcelone</settlement><region nuts="2" type="region">Catalogne</region></placeName></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="1999-09">1999-09</date><biblScope unit="volume">15</biblScope><biblScope unit="issue">4‐5</biblScope><biblScope unit="page" from="237">237</biblScope><biblScope unit="page" to="242">242</biblScope></imprint><idno type="ISSN">0175-8659</idno></series><idno type="istex">D12D62F928EA34321CEC5EDD2F6B6D8D74CF147A</idno><idno type="DOI">10.1111/j.1439-0426.1999.tb00242.x</idno><idno type="ArticleID">JAI237</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">Behavioural modifications of Acipenser baeri were studied during early ontogeny at 18 °C by means of specific tests and general observations. During A. baeri ontogeny, several different periods could be clearly distinguished by behavioural patterns. From hatching to 3 days post hatch (p.h.), specimens exhibited swimming‐up and drift behaviour. A transition from a pelagic to benthic behaviour occurred between 4–5 days p.h. and specimens were positively rheotactic. At 7–8 days p.h., prelarvae aggregated into schools of different shapes. During prelarval development, specimens were positively phototactic, preferred white bottoms and did not show any preference for bottom concealment. Between 9–10 days p.h. coinciding with the onset of the exogenous feeding, larvae were active bottom swimmers, schooling behaviour disappeared and larvae dispersed. During early ontogeny, changes in body coloration were observed among those specimens who swam over bottoms of different brightness and during the day/night cycle. From 9 to 12 days p.h., larvae were positively phototactic, denied bottom cover and showed preference for white substrates. At 13 days p.h., the percentage of fish exhibiting positive phototactism, preferring open to concealed bottom habitats and white bottoms started to decrease, while at 20 days p.h. specimens showed a clear preference for bottom concealment and black and greyish bottoms. The significance, use and evolution of the former behavioural patterns is deeply discussed.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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