Abstract

In this study, cytogenetic properties of E. lucius in Sakarya River were investigated using standard Giemsa staining, C- and Ag-NOR banding techniques. The number of diploid chromosomes (2n) of individuals studied is 50 and karyotype consists of 50 acrocentric chromosomes with decreasing sizes. Secondary constriction was observed on the third autosomal pair in the karyotype. Morphologically distinguishable sex chromosomes were not detected in male and female individuals. Some chromosomes were centromeric C-positive, while some chromosomes were negative. Active NOR is localized in the pericentromeric region of the third autosomal pair and it is related to C-heterochromatin. Our results are similar to those of other studies and this result shows that the cytogenetic properties of the species are quite stable. Moreover, these results may contribute to the cytogenetic and phylogenetic studies of the Esox species in the future.

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