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Environmental Biology of Fishes

, Volume 102, Issue 9, pp 1179–1191 | Cite as

Distinctive reproductive tactics between sympatric specimens of Astyanax aff. fasciatus in the wild and in captivity

  • Gabriela Brambila-Souza
  • Aline Dal’Olio Gomes
  • Renato Massaaki Honji
  • Alexandre Wagner Silva Hilsdorf
  • Renata Guimarães MoreiraEmail author
Article

Abstract

Astyanax fasciatus is a group of neotropical fish with two different diploid chromosome numbers, and in the wild, these individuals are found in sympatry. The annual reproductive cycles of adult females of species with different numbers of chromosomes (G1: 46 chromosomes, low responsiveness to induced spawning; G2: 48 chromosomes, responsive to induced spawning) were investigated in the wild and in captivity. Plasma estradiol (E2) levels, relative fecundity (RF), oocyte diameter, gonadosomatic index, and ovarian morpho-histology were evaluated to identify the ovarian maturation stage. The G1 females in both environments began the vitellogenic phase during winter, concurrent with increased plasma E2 levels. In wild G1 females, large numbers of vitellogenic oocytes were observed during spring and summer, when plasma E2 levels remained high. In contrast, captive G1 females showed higher E2 levels during the winter. They also retained significantly higher RF and vitellogenic oocyte numbers than wild females, but showed no spawning and slow yolk reabsorption. Wild G2 females began the vitellogenic phase in autumn and had progressively increasing E2 levels that peaked in the spring, with spawning occurring during the summer. In captive G2 females, the E2 levels and RF remained high throughout the year. These data suggest that A. aff. fasciatus with different numbers of chromosomes differ in their reproductive performance in the wild and show altered sensitivity to environmental cues in captivity. Our results indicate that G1 females likely respond best to artificial spawning just after winter, whereas G2 females should respond year-round.

Keywords

Estradiol Fecundity Karyotype Lambari Reproduction 

Notes

Acknowledgements

This study was supported by the São Paulo Research Foundation (FAPESP; Research Grant: 08/57687-0) and a Master Scholarship (CNPq-159029/2012-0). The authors would also like to thank the Ponte Nova Fish Farm for providing facilities for maintaining the captive animals and the LAMEROA team for their help with sample collection.

Supplementary material

10641_2019_898_MOESM1_ESM.docx (17 kb)
ESM 1 (DOCX 17 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Instituto de BiociênciasUniversidade de São PauloSão PauloBrazil
  2. 2.Universidade de Mogi das CruzesSão PauloBrazil

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