Abstract
Response of the regressed testes and seminal vesicles was studied after 30-day treatment with partially purified salmon gonadotropin (SG), ovine luteinizing hormone (LH), and testosterone in 237-day hypophysectomized catfish. Daily treatment with SG (0.1, 1, 10, and 100 μg) and LH (1, 10, and 50 μg) produced a dose-dependent response in the testes and seminal vesicles. A dose of 1 μg of SG reinitiated spermatogenesis, whereas a dose of 100 μg of SG not only fully restored spermatogenesis but also induced spermiation. Treatment with 10 μg of LH produced a spermatogenic response in the testes and secretory activity in the seminal vesicles comparable to those induced by 1 μg of SG. A dose of 50 μg of SG and 100 μg of testosterone were equipotent in inducing spermatogenesis in the testes and secretory activity in the seminal vesicles. LH and testosterone at the dose levels used did not induce spermiation. The possibility of one functional gonadotropin regulating the whole maturation phenomenon in the male catfish is discussed.
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