|
|
|
|
|
| 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 |
| |
|
|
| Corrêa,S.A.; Fernandes,M.O.; Iseki,K.K.; Negrão,J.A.. |
| The objective of the present study was to investigate the influence of the establishment of dominance relationships and social stress on plasma cortisol and metabolite levels in Nile tilapia (Oreochromis niloticus). During the 30-day experiment, the fish weighing 236 ± 29 g were kept in individual aquaria, except for two pairings lasting 6 h each. Blood samples were taken from the animals before and after pairing. Display, approach, attack, rebuff, chase flight, and coloration were carried out on days 16 and 30. Activities and behaviors characteristic of the establishment of dominance relationships were described. It was possible to classify all experimental fish (N = 30) as dominant or subordinate. No differences were detected between dominant (N = 15)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tilapia; Social stress; Social relationships; Agonistic behaviors; Cortisol; Dominance. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200015 |
| |
|
| |
|
| |
|
|
| Barreto,R.E.; Volpato,G.L.. |
| Plasma cortisol and glucose levels were measured in 36 adult Nile tilapia males, Oreochromis niloticus (standard length, mean ± SD, 14.38 ± 1.31 cm), subjected to electroshock and social stressors. Pre-stressor levels were determined 5 days after the adjustment of the fish to the experimental aquaria (1 fish/aquarium). Five days later, the effects of stressors on both cortisol and glucose levels were assessed. The following stressors were imposed for 60 min: pairing with a larger resident animal (social stressor), or a gentle electroshock (AC, 20 V, 15 mA, 100 Hz for 1 min every 4 min). Each stressor was tested in two independent groups, one in which stress was quantified immediately after the end of the 60-min stressor imposition (T60) and the other in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stress; Aggression; Agonistic behavior; Fighting; Social stress; Electroshock. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006001200012 |
| |
|
|
|
