This study presents a cytogenetic analysis of the genus Dicentrarchus, represented by two species, D. labrax and D. punctatus. The karyotypes are very similar, even after staining with different techniques. Both species show 48 subtelocentric and acrocentric chromosomes, gradually decreasing in size. One pair of small size chromosomes has heteropycnotic and heteromorphtc short arms of longer size. These short arms are C‐ and Ag‐positive, i.e. nucleolar organizer regions, NORs, are located there. Constitutive heterochromatin is also evident as a subcentromeric band on the long arms of a large chromosome pair. CMA3‐staining confirms the location and the heteromorphism of NORs. DAPI and quinacrine produce homogeneous staining of chromosomes. A review of cytogenetic studies on ‘serranid’ species is also presented.
Journal of Fish Biology – Wiley
Published: Sep 1, 1993
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