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

Gonçalves, Liziane A.B.; Silva, Gicelle M.F.; Viana, Ivana Kerly S.; Hainfellner, Patrick; Ferreira, María Auxiliadora Pantoja; Batlouni, Sérgio Ricardo; Rocha, Rossineide Martins da

doi:10.1016/j.anireprosci.2019.106223

Cited by 2 publications

(1 citation statement)

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“…Only primary spermatocytes with chromatin at different levels of condensation have been observed. Similar results have been reported for other teleosts, showing that at this stage of division, secondary spermatocytes are difficult to visualize due to rapid cell division [ 5 , 34 ].…”

Section: Discussionsupporting

confidence: 86%

Subfamily hypostominae: similarities and differences in testicular structure of amazonian fish

Viana¹,

Gicelle²,

Pantoja³

et al. 2022

BMC Zool

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Background Hypostominae is a subfamily of the family Loricariidae that has a great diversity of species. Accordingly, testicular studies in fish can contribute to the phylogeny and taxonomy of species and to the comparison of reproductive aspects between species. Thus, this work aimed to characterize the testicular morphology and spermatogenesis of the Hypostominae species Baryancistrus xanthellus, Peckoltia oligospila and Hypancistrus zebra. Results B. xanthellus, P. oligospila and H. zebra had an anastomosed tubular type of testis. The germinal epithelium was continuous with unrestricted spermatogonia, and the proliferative, meiotic and spermiogenic phases were defined in all species. In the spermiogenic phase, spermatids were classified as initial, intermediate and final. Only in B. xanthellus in the final phase was there nuclear rotation. The sperm for the three species had a head with an oval shape and a single flagellum composed of the short midpiece, principal piece and end piece. B. xanthellus and P. oligospila showed a cylindrical flagellum and H. zebra showed projections that produced a flattened appearance. Conclusions On the basis testicular structure and ultrastructural characteristics of the germ cells, there was a greater relationship between B. xanthelus and P. oligospila, while H. zebra had particular characteristics. These aspects show that despite belonging to the same subfamily, the species have distinct biological characteristics.

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Section: Discussionsupporting

confidence: 86%