Chromosome complement, C-banding, Ag-NOR and replication banding in the zebrafishDanio reio

Abstract
The chromosome complement ofDanio rerio was investigated by Giemsa staining and C-banding, Ag-NORs and replication banding. The diploid number of this species is 2n=50 and the arm number (NF)=100. Constitutive heterochromatin was located at the centromeric position of all chromosome pairs. Nucleolus organizer regions appeared in the terminal position of the long arms of chromosomes 1, 2 and 8. Replication banding pattern allowed the identification of each chromosome pair.