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Cytogenetic analyses of 2 Astyanax scabripinnis populations from the Amores stream and from Indios river, Ivai basin (state of Parana, Brazil), were carried out. The 2 populations showed same diploid number (2n=48), although differed in the karyotype formulae (8M, 24SM, 4ST, 12A; 8M, 20SM, 6ST, 14A respectively) and in Ag-NOR chromosome number (4, 3 NOR pairs respectively). Constitutive heterochromatin pattern for both populations showed weak centromere markings and big highly stained blocks in the telomeric regions of chromosomes ST and A, coupled to intra- and inter-individual polymorphism with regard to the number of highly stained blocks and in the heterochromatin quantity in homologues of certain chromosomes. Karyotype diversity in different Astyanax scabripinnis populations from Ivai river basin is discussed. The objective of the present study was to detect possible variations that would provide a better understanding of the group's evolution.

Cytogenetic Characterization of Two Populations of Astyanax scabripinnis (Pisces,Characiformes) of the Ivai Basin PR Brazil