Abstract :
[en] 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.
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