Abstract
The testis of Japanese eel (Anguilla japonica) consists of type A and early type B spermatogonia together with inactive Leydig and Sertoli cells. A single injection of human chorionic gonadotropin induced marked changes in the morphology of the testis and in the serum androgen levels within a period of 72 h. Morphological changes include spermatogonial proliferation, activation of Leydig and Sertoli cells, organization of seminiferous lobules and formation of lobular lumen in the testis. Leydig cells were enlarged, exhibiting characteristics of steroid-producing cells. Sertoli cells become elongated, show signs of high cellular activity and remain in close contact with spermatogonia. The lobular organization was achieved much earlier than the progression of spermatogenesis to late type B spermatogonia. Even 6 h after hCG injection, a significant increase in plasma levels of 11-ketotestosterone was observed, followed by a further time dependent increase. Plasma testosterone levels were also increased after injection, but the increase was much less than that of 11-ketotestosterone.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
