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Testicular Structure and Seminal Pathway in the Yellowtail Tetra Astyanax altiparanae (Characiforms: Characidae).

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      Abstract

      This study aimed to describe testicular and its main ducts structure in the yellowtail tetra Astyanax altiparanae, contributing to the knowledge of the region in which semen is produced, storage and released, focusing mainly on the dynamic of germinal epithelium and Sertoli cells during germ cell maturation. Ten sexually mature male A. altiparanae had their testes processed according to the routine protocols to optical microscopy. Moreover, spermatic ducts and tubular compartment of the testes of three specimens were perfused with vinyl resin for gross anatomy and scanning electron microscopy. Astyanax altiparanae testes are paired organs, separated for most of their extension, joining posteriorly in a spermatic duct formed by a squamous simple epithelium. Seminiferous compartment presents anastomosing tubular type organisation, and spermatogonia spread along its extent. Spermatogenesis is of cystic type, and there is no main testicular duct. Spermatogenesis develops in 'waves', from posterior to anterior part of the gonad. Thus, while sperm is storage posteriorly, spermatogenesis keeps maturing germ cells anteriorly, making the germinal epithelium very dynamic, holding Sertoli cells that change their function as a cystic envelope to produce secretions of the seminal fluid and store sperm. Such kind of development is thought to be responsible by the high prolificacy of this species.

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      Affiliations
      [1 ] Faculdade de Ciências da Saúde e Biologicas - FACISB, Instituto de estudos em Saúde e Biologicas - IESB, UNIFESSPA - Universidade Federal do Sul e Sudeste do Pará, Folha 31, quadra 07, Lote especial s/n - Nova Marabá, Marabá Para, 68507-590, Brazil.
      [2 ] Departamento de Biologia e Zootecnia, L.I.NEO - Laboratório de Ictiologia Neotropical, Campus de Botucatu, Programa de Pós-Graduação em Ciências Biológicas (Zoologia), UNESP - Univ. Estadual Paulista, Av: Brasil, Centro, N° 56 Ilha Solteira, São Paulo, 15385000, Brazil.
      [3 ] Departamento de Biologia e Zootecnia, Faculdade de Engenharia de Ilha Solteira, L.I.NEO - Laboratório de Ictiologia Neotropical, UNESP - Univ. Estadual Paulista, Av: Brasil, Centro, N° 56. Ilha Solteira, São Paulo, 15385000, Brazil.
      [4 ] Departamento de Ciências Biológicas, LAMOA - Laboratório de Morfologia de Organismos, Campus de Bauru, UNESP - Univ. Estadual Paulista 'Júlio de Mesquita Filho', Av. Eng. Luiz Edmundo Carrijo Coube, N°14-01, Bauru, São Paulo, 17033-360, Brazil.
      [5 ] Departamento de Biologia e Zootecnia, L.I.NEO - Laboratório de Ictiologia Neotropical, Campus de Ilha Solteira, UNESP - Univ. Estadual Paulista, Av: Brasil, Centro, N° 56. Ilha Solteira, São Paulo, 15385000, Brazil.
      Journal
      Anat Histol Embryol
      Anatomia, histologia, embryologia
      Wiley-Blackwell
      1439-0264
      0340-2096
      May 22 2017
      28543866
      10.1111/ahe.12275

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