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Naiara Guimarães Sales,


I am a Brazilian PhD student, working at the Mariani Lab focusing on freshwater fish genetics and conservation. I have previoulsy been working with DNA barcoding of freshwater fishes from Brazilian basins and also population genetics and species introduction.

My PhD project is about species introduction in a poorly studied basin located in souteast Brazil and further hybridization process among native and non-native species.  The Curimatá, Prochilodus hartii (Characiformes: Prochilodontidae) is one of the most abundant fish species of the Jequitinhonha River Basin and was found to be threatened by hybridization with introduced congeneric species. Therefore, in order to comprehensively understand the consequences of fish introductions and the mechanisms of hybridization with native congeneric species, we propose the combined application of molecular genetics, morphological identification and reproductive analyses to investigate the hybrid fitness in order to understand the consequences of a biological invasion and the potential for “extinction by hybridization”. Also, we will test the environmental DNA approach to identify fish introductions in Neotropical catchments.



  • Sales, NG; Mariani, S; Salvador, GN, Pessali, TC, Carvalho, DC. (2018). Hidden diversity hampers conservation efforts in the Doce river basin: a highly impacted Neotropical river system. Frontiers in Genetics, 9(271)
  • Sales, N. G., Pessali, T. C., Andrade Neto, F. R., Carvalho, D. C. (2017). Introgression from non-native species unveils a hidden threat to the migratory Neotropical fish Prochilodus hartii. Biol. Invasions. 20(3), 555-566
  • Gomes, LC; Pessali, TC; Sales, NG; Pompeu, PS; Carvalho, DC (2015) Integrative taxonomy detects cryptic and overlooked fish species in a neotropical river basin. Genetica 143(5): 581-588
  • Becker, RA; Sales, NG; Santos, GM; Santos, GB; Carvalho, DC (2015) DNA barcoding and morphological identification of neotropical ichthyoplankton from the Upper Parana and São Francisco. Journal Fish Biology 87: 159–168
  • Guimarães-Cruz, RJ; Veloso-Júnior, VC; Sales, NG; Oliveira DAA; Santos, JE (2014) Allometric growth patterns in hatchery-reared larvae of the catfish Lophiosilurus alexandri (Pisces: Pseudopimelodidae). Arq. Bras. Med. Vet. Zootec. 66(1): 284-288

  • Santos, ML; Sales, NG; Arantes, FP; Pessali, TC; Bazzoli, N; Santos, JE (2014) Anatomical and histological organization of the testes of the inseminating catfish Trachelyopterus striatulus (Steindachner, 1877) (Siluriformes: Auchenipteridae). Anat Histol Embryol , 43(4):310-316

  • Sales, NG; Santos, SA; Arantes, FP; Hojo, RES; Santos, JE (2013) Ovarian Structure and Oogenesis of Catfish Pimelodella vittata (Lütken, 1874) (Siluriformes, Heptapteridae). Anat Histol Embryol. 42(3):213-9
Contact Information:
Research Gate
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