Food intake and spontaneous swimming activity in Arctic char (Salvelinus alpinus): role of brain serotonergic activity and social interactions

摘要: We investigated the relationship between social interactions, brain serotonergic activity, and two behavioural patterns in juvenile Arctic char (Salvelinus alpinus): feeding spontaneous swimming activity. Dominant subordinate individuals were observed during rearing pairs, followed by isolation. Throughout experiment, levels of both food intake activity remained high dominant fish. When they was completely inhibited fish; thus, fish able to monopolise food. At same time, as indexed ratio 5-hydroxyindoleacetic acid (5-HIAA) serotonin (5-hydroxytryptamine, 5-HT) elevated hypothalamus stem compared with dominants. During subsequent isolation, intake, but not locomotor gradually increased previously fish, while fell near that Thus, appetite inhibition can be reversed an effect may related reversal a stress-induced activation neurones accompanying subordination. Reduced is either long-lasting response subordination or reflects permanently different strategies individuals. Resume : Nous avons etudie la relation entre les interactions sociales, l'activite serotonergique du cerveau et deux types d'activite, l'alimentation nage spontanee, chez des Ombles chevaliers ( Salvelinus alpinus) juveniles. Des individus dominants subordonnes ont ete observes, d'abord en groupes de deux, puis isoles. Pendant toute duree l'experience, genres d'activite intenses Lorsque poissons etaient etait completement inhibee le poisson avait alors monopole nourriture. ce temps, cerveau, telle qu'evaluee par rapport l'acide hydroxy-5-indoleacetique serotonine (hydroxy-5 tryptamine, elevee dans l'hypothalamus pedoncule cervical comparativement celle enregistree Apres l'isolement poissons, l'alimentation, mais pas locomotrice augmente graduellement ces est redevenue semblable L'inhibition l'appetit peut donc etre inversee sans doute renversement l'activation serotonergiques sous l'action stress qui accompagne sociale. La diminution natatoire interpretee comme une reaction longue sociale, ou elle reflete comportementales differentes prevalent permanence subordonnes.