Abstract
Studies were conducted on the effect of human chorionic gonadotropin (HCG), testosterone and desoxycorticosterone acetate (DOCA) on the histological picture of the nucleus preopticus (NPO), hypophysis and gonads of male European eels. It was ascertained that none of the injections used changed the content of the Gomori‐positive material within the NPO cells. HCG and testosterone injections altered the histological picture of the hypophysis and injections of HCG influenced the gonads by accelerating their maturity. The injections of DOCA did not change the histological picture of the hypophysis and gonads in male eels.
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