Existence of an extra-retinal and extra-pineal photoreceptive organ that regulates photoperiodism in gonadal development of an Osmerid teleost, ayu (Plecoglossus altivelis)
Keywords: توسعه گونادال; Ayu Plecoglossus altivelis; Extra-pineal and extra-retinal photoreceptor; Gonadal development; Gonadosomatic index; Lateral eyes; Photoperiodism; Pineal complex; Sex steroids;