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Karyotypic analysis on 25 specimens of Uranoscopus scaber from the Gulf of Palermo has revealed the occurrence of an intra-populational mosaicism of Robertsonian type with three distinct diploid numbers: 2n = 30, 2n 29 and 2n = 28. Intra-individual mosaicism in the chromosome number (2n =30 and 31 in two specimens and 2n= 28 and 29 in one specimen) is also reported. One large metacentric pair is characterized by secondary constrictions, variable in length in different fish. Polymorphisms of these areas seem to have a genetic, rather than transcriptional, basis.

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