作者: Tomohiro Masuda , Masayuki Iigo , Katsumi Aida
DOI: 10.1016/J.CBPB.2005.01.004
关键词:
摘要: Ayu (Plecoglossus altivelis) is an Osmerid teleost whose gonadal development exhibits clear photoperiodism: it stimulated and prevented under short long photoperiod, respectively. However, the photoreceptor organ involved in this process remains to be identified. In present study, we examined whether gonads of ophthalmectomized (Ex) pinealectomized (Px) ayu respond photoperiod test photoreceptors other than lateral eyes pineal complex are photoperiodic response development. Gonadosomatic index (GSI) plasma levels sex steroids (testosterone 11-ketotestosterone for males testosterone estradiol 17-beta females) were significantly increased Ex+Px kept both females as compared with initial control. On hand, there no significant increases GSI photoperiod. Histological observation revealed that oocytes undergoing final maturation proliferation germ cells observed but not These results indicate extra-retinal extra-pineal photoreceptive regulates species.