Testicular structure and development of germ cells of Hypophthalmus marginatus Valenciennes 1840 (Siluriformes: Pimelodidae)

Autor(es)

Goncalves, Liziane Amaral B. ^[1] ; Silva, Gicelle M. F. ^{[1, 2]} ; Viana, Ivana Kerly S. ^[1] ; Hainfellner, Patrick ^[3] ; Ferreira, Maria Auxiliadora P. ^[2] ; Batlouni, Sergio R. ^[3] ; Rocha, Rossineide M. ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Para, Lab Cellular Ultrastruct, Biol Sci Inst, Rua Augusto Correa 01, BR-66075110 Belem, Para - Brazil

^[2] Fed Univ Para, Biol Sci Inst, Lab Immunohistochem & Dev Biol, Rua Augusto Correa 01, BR-66075110 Belem, Para - Brazil

^[3] Paulista State Univ Julio de Mesquita Filho, Ctr Aquaculture CAUNESP, Path Access Prof Paulo Donato Castelane S-N, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Animal Reproduction Science; v. 211, DEC 2019.
• Citações Web of Science: 0

Resumo

The present study was conducted to assess the testicular structure and germ cell ultrastructure of Hypophthalmus marginatus during spermatogenesis. Semen and sections of the mid-region of the testis were collected, processed, and analyzed using optical and electron microscopy. Macroscopically, the testes of H. marginatus were filiform, and the testicular parenchyma was composed of spermatogenic cells that proliferated, organized within spermatic cysts. During spermiogenesis, spermatids had no nuclear rotation. The proximal centriole was perpendicular to the distal centriole, characteristic of type III spermiogenesis. Spermatozoa were released into the lumen of the seminiferous tubules and had an ovoid head without an acrosome, condensed nucleus, and shallow nuclear fossa. The midpiece was short, with a single long flagellum. The flagellum had the typical axoneme structure, with nine pairs of peripheral and a central pair of microtubules. The thin end piece comprised only peripheral microtubules. Spermatogenesis in H. marginatus features filiform testes, cystic spermatogenesis, and type III spermiogenesis. (AU)

• Processo FAPESP: 10/51271-6 - Cultivo do mapará e do camarão-da-Amazônia em sistemas multiespaciais e multitróficos
• Beneficiário: Sergio Ricardo Batlouni
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE