Impaired spermatogenesis in the Japanese eel, Anguilla japonica: possibility of the existence of factors that regulate entry of germ cells into meiosis.


In the cultivated male Japanese eel, spermatogonia are the only germ cells present in the testis. Weekly injections of human chorionic gonadotropin (HCG) can induce complete spermatogenesis from proliferation of spermatogonia to spermiogenesis. In some cases, however, HCG injection fails to induce complete spermatogenesis. Testicular morphological… (More)


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