R. Hannes

Effects of Rank‐order Fights on Whole‐body and Blood Concentrations of Androgens and Corticosteroids in the Male Swordtail (Xiphophorus helleri)

D. Franck, F. Liemann, R. Hannes, 2010 .

The effect of social isolation on androgen and corticosteroid levels in a cichlid fish (Haplochromis burtoni) and in swordtails (Xiphophorus helleri)

D. Franck, R. Hannes, Ralph-P. Hannes, 1983, Hormones and Behavior.

Androgen and Corticoid Levels in Blood and Body Extracts of High‐ and Low‐ranking Swordtail Males (Xiphophorus helleri) before and after Social Isolation

R. Hannes, 2010 .

Blood and whole‐body androgen levels of male swordtails correlated with aggression measures in a standard‐opponent test

R. Hannes, Ralph-P. Hannes, 1986 .

Effects of social isolation on aggressiveness in fish with special reference to the swordtail (Xiphophorus helleri)

D. Franck, A. Ribowski, R. Hannes, 1985, Behavioural Processes.

The influence of standard-opponent tests on blood androgen and corticoid levels of high- and low-ranking swordtail males (Xiphophorus helleri) before and after social isolation

R. Hannes, 1985 .

Diurnal variation of blood androgen and corticoid levels in male swordtails (Xiphophorus helleri)

D. Franck, R. Hannes, 1983 .