Small yellow eels, 15-18 cm long, reared in warmed (22°-24°C) fresh water were treated by 17-alfa-methyltestosterone (MT) or 17-alfa-ethylestradiol (EE) given with the diet, at two different dosages and two durations. At the rearing conditions the untreated eels develop in a very large majority male gonads. The expected masculizing effect of MT could not be shown. The histological observations of MT treated eel gonads suggests that the androgen may inhibit the ovarial differentiation. EE at the higher dose and longer duration produce a feminization effect.
Sex differentiation in the European eel (Anguilla anguilla L.): effects of sex steroids
COLOMBO, Giuseppe;GRANDI, Gilberto
1991
Abstract
Small yellow eels, 15-18 cm long, reared in warmed (22°-24°C) fresh water were treated by 17-alfa-methyltestosterone (MT) or 17-alfa-ethylestradiol (EE) given with the diet, at two different dosages and two durations. At the rearing conditions the untreated eels develop in a very large majority male gonads. The expected masculizing effect of MT could not be shown. The histological observations of MT treated eel gonads suggests that the androgen may inhibit the ovarial differentiation. EE at the higher dose and longer duration produce a feminization effect.File in questo prodotto:
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