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Gonad and androgenic gland development in relation to sexual morphology in Pandalopsis japonica Balss, 1914 (Decapoda, Pandalidae)

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This paper describes the role of the androgenic gland (AG) in the reproductive phase change from male to female in the protandrous hermaphroditic shrimp, Pandalopsis japonica. The differentiation of external sexual characters is presented in relation to the development of the hermaphroditic gonad and the AG. Juveniles (≤11 mm carapace length (CL)) externally exhibit male morphological characters, but do not show differentiated testicular tissue internally. Sexually functional males (14-23 mm CL) have both spermatogenesis and spermiogenesis in their testicular tissue, while the ovarian portion of the gonad increases in size and there is proliferation of the oogonia and of young ova. In males approaching sex reversal, the AG starts degenerating, and in the female stage the gland has completely disappeared. The male primary and secondary sexual characters degrade almost at the same time. This suggests that the role of the AG and/or of the endocrine system in protandrous hermaphroditic shrimp is different from that in non-hermaphroditic shrimp. We suggest that the AG only induces differentiation of male primary and secondary sexual characters. Cet article décrit le rôle de la glande androgène (AG) au cours du changement de la phase reproductive de mâle à femelle chez la crevette hermaphrodite protandrique, Pandalopsis japonica. La différenciation des caractères sexuels externes est présentée par rapport au développement de la gonade hermaphrodite et de l'AG. Les juvéniles (≤11 mm de longueur de carapace (CL)) présentent extérieurement des caractères morphologiques mâles, mais n'ont pas différencié un tissu testiculaire interne. Les mâles sexuellement fonctionnels (14-23 mm CL) ont à la fois des caractères de spermatogenèse et de spermiogenèse dans leur tissu testiculaire, tandis que la partie ovarienne de la gonade augmente en taille et il y a prolifération d'oogonies et de jeunes oeufs. Chez les mâles approchant de l'inversion sexuelle, les AG commencent à dégénérer, et au stade femelle, la glande a complètement disparu. Les caractères sexuels mâles primaires et secondaires se dégradent presque en même temps. Ceci suggère que le rôle de l'AG et/ou du système endocrine chez la crevette protandrique hermaphrodite sont différents de ceux de la crevette non hermaphrodite. Nous suggérons que l'AG induit seulement la différenciation des caractères sexuels mâles primaires et secondaires.

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/content/journals/10.1163/156854006777584269
2006-05-01
2016-09-25

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