Gonadal and thyroid hormones in the barbel (Barbus barbus) during and outside short reproductive cycles

in Folia Zoologica (1998), 47

Sex steroids with thyroid hormones were studied during reproduction in the European barbel Barbus barbus L., a new species for European aquaculture. In female barbel, the period between two successive ... [more ▼]

Sex steroids with thyroid hormones were studied during reproduction in the European barbel Barbus barbus L., a new species for European aquaculture. In female barbel, the period between two successive ovulations (every 12-18 days) was characterized by high estradiol-17 beta (E-2) levels (>300 pg.ml(-1)) and a sinusoidal variation of these levels. Outside the reproductive periods, the E-2 plasma concentration was significantly lower (100 pg.ml(-1)) and invariation. The spermiating males showed significantly higher testosterone (T) plasma values than non-spermiating ones. The opposite was noticed for the plasma thyroxine (T-4) concentrations: low values in males and females during reproduction, high values outside reproductive periods. Spermiating males had a higher triiodothyronine (T-3) plasma concentration compared to non-spermiating ones, whereas no significant difference is seen for the females. [less ▲]

Behavioural and endocrine study of Oreochromis aureus, with special reference to sex-reversed males. In Proceedings of the Fifth International Symposium on the Reproductive Physiology of Fish

in Goetz, F. W.; Thomas, P. (Eds.) Fish Symposium 95 (1995)

Hormonal profile associated with social behavior in Oreochromis aureus.

Poster (1993)

Sexual and social behaviour of Oreochromis aureus (Pisces : Cichlidae) : endocrine profiles.

in Belgian Journal of Zoology (1992), 122(2), 251