Two types of endocrine tissues are encountered in the teleost testis, the typical interstitial tissue, which is also found in higher vertebrates, and the lobule-boundary cells which may be the only endocrine tissue in the testes of some teleosts (Marshall & Lofts, 1956). The inference that these tissues produce androgens is based on the following grounds: (1) changes in the histological appearance of the interstitial and the boundary cells concomitant with the reproductive state of the fish (Henderson, 1962); (2) development of male secondary sex characters in fishes after the administration of mammalian androgens (Pickford & Atz, 1957; Dodd, 1960); (3) isolation of progesterone, oestriol, oestrone and 11-ketotestosterone from the testis and blood of certain bony fishes (Chieffi, 1962; Schmidt & Idler, 1962). Histochemistry, apart from enabling morphological allocation, provides a simple means for the determination of tissue constituents while requiring very minute amounts of tissue. However, the histochemical studies
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Z. Yaron (1966) studied this question.