Differential action of androgen implants on the spermatogenesis of pre-pubertal sea bass exposed to a continuous light regime

This study investigated the influence of long-term T and 11-KT administration (by means an implant) on synthesis release gonadotropins (Fsh, Lh) spermatogenesis progression in juvenile male sea bass exposed to either a natural photoperiod (NP) or continuous light (LL). The results control group indicated clear role for Fsh recruitment type-A spermatogonia (SPGA) towards more advanced stages under NP regime. promoted androgen SPGA differentiation into spermatocytes, while no significant changes pituitary Gnrh1 plasma Lh levels were detected. On other hand, LL regime inhibited synthesis, although effects observed Lh, was arrested. increased content reduced content, regardless regime, inhibitory effect stronger than that 11-KT. Our show exogenous fish able partially restore spermatogenesis, thus stimulating gonadal development eliciting spermiation few fish, males received implants remained sexually immature LL. In addition, our provided new knowledge about importance bioactivity modulation regulation this gonadotropin function, turn, fish.