Ovarian follicular structure in several South American catfishes

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Ovarian follicular structure in several South American catfishes

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Viana, I. K. S., Ferreira, M. A. P., Mendes, Y. A., Silva, B. R. M., Gonçalves, L. A., & Rocha, R. M. (2023). Follicular complex may predict reproductive tactics in siluriform fishes. Heliyon, e16204.
https://doi.org/10.1016/j.heliyon.2023.e16204
https://www.sciencedirect.com/science/a ... 4023034114
Highlights
  • Morphology of the follicular complex indicates reproductive strategy.
  • Fish with parental care have a larger zona radiata.
  • Migratory fish have a smaller follicular complex.
Abstract
In this study, we evaluated the morphology and morphometry of the layers that make up the follicular complex surrounding mature oocytes in the six fish species , , , , and , belonging to the order Siluriformes, which inhabit the Amazon basin. On the basis of the morphology and thickness of the layers of the follicular complex, the species were divided into two groups: 1- A. longimanus, A. Ucayalensis and H. marginatus and 2 – B. xanthellus, P. tankei and P. oligospila. The total thickness of the layers that make up the follicular complex showed a difference between type III and IV oocytes for all species of each group. Differences in the theca layer, follicular cells and zona radiata between species and between groups were submitted to statistical analysis. Morphologically, group 1 showed columnar follicular cells and thin zona radiata. Meanwhile, group 2 displayed a layer of cuboidal-shaped follicular cells layer and thicker zona radiata. These differences may be related to the environment and reproductive behaviors, as group 1 migrates without parental care and has eggs that are generally smaller and abundant. While group 2, represented by loricariidae, inhabit lotic environments, have reproductive tactics of parental care and eggs that are generally large and in small numbers. Therefore, we can infer that the follicular complex in mature oocytes can predict the reproductive tactics of the species.
Keywords: Follicular complex, Histology, Oocyte layer, Reproduction, Teleostei, and ultrastructure
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