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Brazilian Archives of Biology and Technology

versão impressa ISSN 1516-8913

Resumo

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 1516-8913.  http://dx.doi.org/10.1590/S1516-89132008000200011.

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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