Abstract
The bighead carp ( Aristichthys nobilis) and the silver carp ( Hypophthalmichthys molitrix) were introduced into Brazil in 1979 from China for the aquaculture programs conducted by the Centro de Pesquisas e Treinamento em Aquicultura (CEPTA), Pirassununga, SP. Hybrids between bighead carp females and silver carp males were obtained in 1989. Reported here are the cytogenetic analysis of parental lines and hybrids, including Ag-stained NORs and C-banding patterns. The two species and hybrids have 2 n = 48 chromosomes, consisting of 12 pairs of meta-submetacentrics and 12 pairs of subtelocentrics. The Ag-NOR pattern, which consisted of four pairs of nucleolus organizers in both species and the conventional Giemsa staining of chromosomes were ineffective for the cytogenetic characterization of the hybrids and of the two parental species. C-bands, in contrast, were effective markers in the characterization of the karyotypes of the two species and of their hybrids because of the presence of distinct heterochromatin blocks in one chromosome pair of A. nobilis. This chromosome marker was useful in the identification of the parental haploid sets in the hybrids.
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