Marine Biology

, Volume 112, Issue 1, pp 37–41 | Cite as

Karyotype analyses reveal inter-individual polymorphism and association of nucleolus-organizer-carrying chromosomes in Capros aper (Pisces: Zeiformes)

  • R. Vitturi
  • F. Lafargue


Three different karyomorphs with 2n=46, 2n=44 and 2n=42 for Capros aper (L., 1758) (Zeiformes) collected from the Gulf of Lion, near Banyuls-sur-Mer, France, in July 1990 were determined. Karyomorphs were characterized by the same arm number [Fundamental number (FN)=50], suggesting that chromosome variations are due to Robertsonian fusions. In somatic metaphase spreads stained with silver nitrate, nucleolus organizer regions (NORs) consistently occupied a terminal position on the short arms of two small submetacentric chromosomes. Ca. 30% of silver-stained metaphases in each specimen showed NOR chromosomes associated in pairs by their nucleolus organizer regions.


Nitrate Silver Nitrate Organizer Region Karyotype Analysis Nucleolus Organizer Region 
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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • R. Vitturi
    • 1
  • F. Lafargue
    • 2
  1. 1.Institute of ZoologyUniversity of PalermoPalermoItaly
  2. 2.Observatoire Oceanologique de Banyuls, Laboratoire AragoUniversité P. et M. Curie (Paris VI), CNRS UA 117Banyuls-sur-MerFrance

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