Structural and ultrastructural characteristics of the spermatogenesis of the grey armored catfish Liposarcus anisitsi (Holmberg, 1893) (Teleostei, Siluriformes)

Authors

  • Claudinei da Cruz Universidade Estadual Paulista, Centro de Aquicultura, Departamento de Fitossanidade, Laboratório de Ecotoxicologia, Jaboticabal, SP
  • Antônio Marcos Orsi Universidade Estadual Paulista, Departamento de Anatomia, Botucatu, SP
  • Karina Simões Universidade Estadual de Campinas, Departamento de Anatomia, Campinas, SP
  • Carlos Alberto Vicentini Universidade Estadual Paulista, Departamento de Ciências Biológicas, Bauru, SP

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.2005.26452

Keywords:

Spermatogenesis, Ultrastructure, Siluriforme, Liposarcus anisitsi

Abstract

Liposarcus anisitsi is a freshwater teleost from Siluriform order with external fertilization that shows cystic spermatogenesis process with spermatogonial unrestricted lobular structure of the testes. In this species, isolated or intracystic primary spermatogonia were noted as the ¨stem cells¨ of the spermatogenetic lineage. Thus, as consequence of the cystic spermatogenesis process of Liposarcus anisitsi all the three germinative cells are observed inside specific spermatogenetic cysts, since the primary and secondary spermatogonias until the spermatocytes and early and late spermatids. Spermatogonia show spherical shape with central nuclei and great amount of round mitochondria and ER profiles mainly of rough type in their cytoplasm. Primary spermatocytes have inter-relations through cytoplasmic bridges and are clearly identified by presence of synaptonemic complexes inside the nuclei. Early spermatids beginning maturational phases, as well as the late spermatids, tend to exhibit spherical nuclei, variable chromatin pattern with progressive condensation during the end steps of the spermiogenesis. In this end steps, the late spermatids show the nuclear fossa formed to the fixation of the flagella. The spermatozoon of Liposarcus anisitsi shows round head, round nuclei, very dense chromatin, lack of acrosoma, short middle piece and long tail (principal and end pieces of the flagellum).

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Published

2005-02-01

How to Cite

Cruz, C. da, Orsi, A. M., Simões, K., & Vicentini, C. A. (2005). Structural and ultrastructural characteristics of the spermatogenesis of the grey armored catfish Liposarcus anisitsi (Holmberg, 1893) (Teleostei, Siluriformes). Brazilian Journal of Veterinary Research and Animal Science, 42(1), 37-44. https://doi.org/10.11606/issn.1678-4456.bjvras.2005.26452

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