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Morphology of the urogenital papilla and its component ducts in Astyanax altiparanae Garutti & Britski, 2000 (Characiformes: Characidae) Neotropical Ichthyology
Siqueira-Silva,Diógenes Henrique de; Silva,Amanda Pereira dos Santos; Ninhaus-Silveira,Alexandre; Veríssimo-Silveira,Rosicleire.
The histological description of the urogenital papilla is an important tool to comprehension of the reproductive mechanisms in fish, as well as a pre-requisite to germ cell transplantation in adult fish, besides to be a good biological indicator to environmental changes. Was performed the histological description of the urogenital papilla and its component ducts in the tetra Astyanax altiparanae. The genital and urinay ducts pass separately throughout most part of its extension, joining in a single duct before opening. In males this opening is asymmetric and seems to have double origin, being completely surrounded by striated muscle fibers, while in females it is symmetric and the muscle fibers does not surround it totally. Spermatic duct and oviduct...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish reproduction; Histological analysis; Oviduct; Sperm duct; Urinary duct.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200309
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Reproductive cycle of the Neotropical cichlid yellow peacock bass Cichla kelberi: A novel pattern of testicular development Neotropical Ichthyology
Siqueira-Silva,Diógenes Henrique de; Vicentini,Carlos Alberto; Ninhaus-Silveira,Alexandre; Veríssimo-Silveira,Rosicleire.
The present study describes the testicular maturation phases (associating the germ cells development and the morphological changes suffered by the germinal epithelium along the whole year), and the testicular morphology in the yellow peacock bass Cichla kelberi, relating it to other species. For this purpose, 78 specimens were studied according conventional techniques of light microscope. The testes in C. kelberi were classified as unrestricted spermatogonial lobular, an apomorphic characteristic in the recent groups of Teleost. Furthermore, were defined five testicular maturation phases: Preparatory phase; Early Germinal Epithelium Development; Mid Germinal Epithelium Development; Late Germinal Epithelium Development and; Regression. Similar...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germinal epithelium; Gonadal maturation; Reproductive phases; Spermatogenesis; Testes.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300587
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