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Auteur BENHAIM, D.; BEGOUT, M.-L.; PEAN, S.; BRISSET, B.; LEGUAY, D.; CHATAIN, B.
Titre Effect of fasting on self-feeding activity in juvenile sea bass (Dicentrarchus labrax) Type Article scientifique
Année 2012 Publication Revue Abrégée Applied Animal Behaviour Science
Volume 136 Numéro 1 Pages 63-73
Mots-Clés Feeding-behaviour; Personality; Plasticity; Self-feeder; Social structure
Résumé In various experiments under self-feeding conditions, sea bass groups could be divided into three categories regarding feeder actuation: high, low and zero-triggering fish. In all cases few high-triggering fish were responsible for a high percentage of the feed delivery. A question was raised about the role played by feeding motivation in such high-triggering status acquisition. It was approached by applying a 3-week fasting period in order to induce similar negative specific growth rate (SGR) in two groups of fish of similar mean weight but with either a low or a high coefficient of variation for weight (CVw)(T-low: CVw similar to 11%, 3 tanks of 60 fish each; T-high: CVw similar to 20%, 3 tanks of 60 fish each). These groups were created to test the consistency of behavioural responses in two different contexts (i.e. two population size-distributions). During the follow-up period of 40 days, the group level feed-demand behaviour was not strongly modified by the fasting period and there were no differences between T-low and T-high groups. Complete growth compensation was the same in all tanks as observed at the end of the experiment. At the individual level, high-triggering fish were exactly the same individuals before and after the fasting period. Up to four high-triggering fish could be observed according to the tank and when several fish were performing high-triggering activity, their rankings were sometimes reversed after the fasting period. High-triggering fish increased their activity levels after the fasting period showing behavioural plasticity. High-triggering status could neither be explained by an initial lower SGR nor a sex effect, nor by any of the measured physiological blood parameters. Thus, individual's triggering activity levels could be related to personality and/or metabolic traits but further research is required to confirm this assumption. (C) 2011 Elsevier B.V. All rights reserved.
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ISSN 0168-1591 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 171
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Auteur Benhaim, D.; Ferrari, S.; Colchen, T.; Chatain, B.; Begout, M.-L.
Titre Relationship between individual and group learning in a marine teleost: A case study with sea bass under self-feeding conditions Type Article scientifique
Année 2017 Publication Revue Abrégée Learn Behav.
Volume 45 Numéro 3 Pages 276-286
Mots-Clés animal groups; Behavior; dicentrarchus-labrax; example; fish; Group conditions; growth; Juveniles; Operant conditioning; Personality traits; Positive reinforcement; Producer-scrounger; producer-scrounger game; Social structure; traits; zebrafish danio-rerio
Résumé Fish learning and cognition are usually approached by testing single individuals in various devices such as mazes that have serious drawbacks, especially in gregarious species, including the stress induced by the test procedure. This might impair the results and lead to misinterpretation about the learning abilities of the targeted species. In order to provide an alternative to the individual-based tests, we investigated for the first time the operant conditioning of four similar groups (50 individuals per tank) of sea bass. We used two computerized self-feeder devices per tank, each coupled with individual electronic identification and that were alternately activated during varying positive appetitive reinforcement period of time (7 to 1 day). Learning abilities were examined at both group and individual levels. At the group level, the operant conditioning was demonstrated as the triggering activity significantly decreased when the device was turned off and increased when it was turned on, whatever the reinforcement period duration. The individual level analysis revealed a more complex situation with fish showing different learning performances that can be best explained through the producer-scrounger game theory.
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Auteur institutionnel Thèse
Editeur Lieu de Publication Éditeur
Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 1543-4494 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2191
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