Effects of hypophysectomy on the testis and secondary sex characters of the adult guppy Poecilia reticulata Peters

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Abstract
Hypophysectomy of the adult guppy causes marked regression in the testis, completely blocks mitosis in the spermatogonia, and prevents their transformation into spermatocytes. However, spermatocytes, spermatids, and sperm already present in the testis at the time of operation develop into spermatophores. The spermatophores rupture after 8 weeks and the resulting sperm are phagocytosed within the sperm ducts. The epithelial cells lining the sperm ducts, the Sertoli cells, and the interstitial cells regress. Of two particularly well-differentiated secondary sex characters, the gonopodium (modified anal fin) remains unaffected, while the patches of bright lipophores (yellow and red pigments) present on the sides of the body become faint or entirely disappear.

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