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Behavioral and neurophysiological responses of European sea bass groups reared under food constraint ArchiMer
Di Poi, Carole; Attia, J; Bouchut, C; Dutto, Gilbert; Coves, Denis; Beauchaud, M.
The individual food-demand behavior of juvenile European sea bass (Dicentrarchus labrax, L.) reared in groups under self-feeding conditions was investigated. The triggering activity on self-feeder, i.e. index of the food-demand activity, agonistic interactions and territorial behavior were monitored for periods of 42 to 68 days in six groups of 50 fish. The specific growth rate was calculated and the brain serotonergic activity was used as a stable index of social stress. Inter-individual differences appeared in triggering activity and three groups were distinguished: 3-5 high-triggering fish, 17-30 low-triggering fish and the remaining individuals were null-triggering fish. There were no significant differences in specific growth rates calculated at the...
Tipo: Text Palavras-chave: Social stress; Brain serotonergic activity; Territorial behavior; Agonistic interactions; Self feeding; European sea bass; Triggering activity; Food demand behavior.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2637.pdf
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Effects of high food-demand fish removal in groups of juvenile sea bass (Dicentrarchus labrax) ArchiMer
Di Poi, C; Beauchaud, M; Bouchut, C; Dutto, Gilbert; Coves, Denis; Attia, J.
In self-feeding conditions, a few individual sea bass (Dicentrarchus labrax (L., 1758)) display strong activity in striking the food dispenser, whereas the remaining individuals of the group actuate the feeder weakly or never. Here, we investigated the effects of removal of the individuals showing dominant activity on the social and feeding behaviours in groups of juvenile sea bass. Following removal, new fish showing a dominant self-feeding activity quickly appear. They always come from the group of fish that have a low number of triggering actuations. This observation shows that it takes less time, about 5 days after the removal of dominant triggerers vs. 14 days at the beginning, for the re-establishment of the behavioural structure, suggesting the...
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4766.pdf
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Long-term monitoring of individual fish triggering activity on a self-feeding system: An example using European sea bass (Dicentrarchus labrax) ArchiMer
Coves, Denis; Beauchaud, M; Attia, J; Dutto, Gilbert; Bouchut, C; Begout, Marie-laure.
In two experiments, a computerized on-demand feeding system coupled with a PIT tag monitoring device was used to continuously record the triggering activity by ca. 50 individual sea bass for 55 days (Exp. 1, initial average body weight and coefficient of variation, CV: 299 g, 15%) and 69 days (Exp. 2, 157 g, 13%). Each group was stocked in 1 m(3) tanks and exposed to a water temperature of 21 +/- 1 degrees C and a light regime of 16:8 LD. Only 5% of the triggering activity was not associated with simultaneous PIT tag detection. Although each individual was detected via PIT tag during the experiment, only 67% and 74% of the fish actuated the trigger at least once in Exp. 1 and Exp. 2, respectively. Moreover, only two fish in Exp. 1 and one fish in Exp. 2...
Tipo: Text Palavras-chave: PIT tag detection antenna; Individual triggering activity; Self feeding; Sea bass.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1341.pdf
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