Citation

Oliveira RF, Carneiro LA, Canário AV. Nature 2005; 437(7056): 207-208.

Affiliation

Unidade de Investigação em Eco-Etologia, Instituto Superior de Psicologia Aplicada, 1149-041 Lisboa, Portugal. ruiol@ispa.pt

Copyright

(Copyright © 2005, Holtzbrinck Springer Nature Publishing Group)

DOI

10.1038/437207a

PMID

16148924

Abstract

Androgens are the principal sex steroids controlling reproduction and aggression in male fish, but their production can also be affected by social interactions. Here we show that androgen concentrations are not significantly increased in cichlid fish (Oreochromis mossambicus) that are fighting their own image in a mirror, despite their aggressive behaviour towards the virtual intruder. Our results indicate that the hormonal response normally triggered in male contests is not induced under these circumstances by the act of fighting itself, and that it may therefore depend on some indicator of relative fighting ability that cannot be delivered by a mirror-image challenger.

Language: en