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Fig. 1. Induction of spermatogenesis by hCG injection into the Japanese eel. Under culture conditions, male Japanese eels have immature testes (small arrows) containing only non-proliferated type A and early type B spermatogonia. A single injection of human chorionic gonadotropin (hCG) can induce testicular development (arrowheads) for 18 days. These eels have a lot of spermatozoa in their testes. Electron micrographs are reprinted with permission from Zoological Science, 8, Miura et al., Induction of spermatogenesis in male Japanese eel, Anguilla japonica, by a single injection of human chorionic gonadotropin, 63–73, Fig. 2, © 1991, Zoological Society of Japan.

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