Abstract
The effect of a gonadotropin-releasing hormone analog (GnRHA, HOE766) was studied in hypophysectomized elasmobranch fish Torpedo marmorata and T. ocellata. In addition, estradiol (E 2) effects were studied in intact and hypophysectomized (HPX) animals. Plasma androgen concentrations were measured 2 or 6 hr after GnRHA (100 ng or 10 μg) or 6 hr after E 2 (10 −9 or 10 −6 M) intratesticular injections. Both GnRHA and E 2 induced the increase of plasma androgen levels in HPX fish. E 2 also enhanced androgen levels in intact animals. It is concluded that GnRH-like substances and E 2 may modulate testicular activity in elasmobranch fish.
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