Artículos de revistas
Social challenge increases cortisol and hypothalamic monoamine levels in matrinxã (Brycon amazonicus)
Fecha
2015Registro en:
Fish Physiology And Biochemistry, p. 1501-1508, 2015.
1573-5168
10.1007/s10695-015-0102-5
89991497257336
26205527
0000-0001-6623-8095
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The neural circuitry for social behavior and aggression appears to be evolutionarily conserved across the vertebrate subphylum and involves a complex neural network that includes the hypothalamus as a key structure. In the present study, we evaluated the changes in monoamine levels in the hypothalamus and on serum cortisol and plasma glucose of resident matrinxã (Brycon amazonicus) submitted to a social challenge (introduction of an intruder in their territory). The fight promoted a significant increase in hypothalamic 5-HT, NA and DA levels and on the metabolites 5-HIAA and DOPAC, and decreased 5-HIAA/5-HT and DOPAC/DA ratios in resident fish. Furthermore, an increase in serum cortisol and plasma glucose was also observed after the fight. Resident fish presented a high aggressiveness even with increased 5-HT levels in the hypothalamus. The alteration in hypothalamic monoaminergic activity of matrinxã suggests that this diencephalic region is involved in aggression and stress modulation in fish; however, it does not exclude the participation of other brain areas not tested here.