Effect of fasting on self-feeding activity in juvenile sea bass (Dicentrarchus labrax)

Type Article
Date 2012-01
Language English
Author(s) Benhaim David1, Begout Marie-LaureORCID2, Pean Samuel2, Brisset Blandine2, Leguay Didier2, Chatain Beatrice3
Affiliation(s) 1 : INTECHMER CNAM, LERMA, F-50103 Cherbourg, France.
2 : IFREMER, F-17137 Lhoumeau, France.
3 : IFREMER, Lab Rech Piscicole Mediterranee, Stn Expt Aquaculture, F-34250 Palavas Les Flots, France.
Source Applied Animal Behaviour Science (0168-1591) (Elsevier Science Bv), 2012-01 , Vol. 136 , N. 1 , P. 63-73
DOI 10.1016/j.applanim.2011.11.010
WOS© Times Cited 14
Keyword(s) Personality, Plasticity, Feeding-behaviour, Self-feeder, Social structure
Abstract 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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