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vol.51 número2Chromosomal studies of five species of the marine fishes from the Paranaguá Bay and the karyotypic diversity in the marine teleostei of the Brazilian coastGrowth evaluation of Oreochromis niloticus (Cichlidae, Neopterygii) exposed to Trichlorfon índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Archives of Biology and Technology

versão On-line ISSN 1678-4324


SA, Maria de Fátima Pereira de; FRAGOSO-MOURA, Evelise Nunes; FENERICH-VERANI, Nelsy  e  FERRO, Dagmar Aparecida de Marco. Occurrence of intersexuality in " Lambaris" , Astyanax scabripinnis (Jenyns, 1842), small characids from the Brazilian streams. Braz. arch. biol. technol. [online]. 2008, vol.51, n.2, pp.315-322. ISSN 1678-4324.

During studies carried out with a small characid (Astyanax scabripinnis), from the Brazilian streams located in Cerrado biome, some gonads of fishes exhibited sparse oocytes in perinucleolar stage embedded in normally developing testicular tissues. Another pattern of gonad intersex with vitellogenic oocytes and mature lobules was observed in the gonads of fishes collected from a reservoir supplied by the Atlantic Forest stream. These gonads in different stages of maturation were examined histologically. The results revealed the patterns occurring in fishes of the same species, from four different populations.

Palavras-chave : Intersexuality; Neotropical ichthyofauna; Characidae; Tetras; Stream fishes.

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