Ichthyological Research

, Volume 52, Issue 1, pp 94–97

Karyotype of North American shortnose sturgeon Acipenser brevirostrum with the highest chromosome number in the Acipenseriformes

Authors

    • Department of AquaculturePukyong National University
  • Yoon Kwon Nam
    • Department of AquaculturePukyong National University
  • Jae Koo Noh
    • National Fisheries Research and Development InstituteGeoje Marine Hatchery
  • Chul Hong Park
    • Department of Fisheries and Aquatic SciencesUniversity of Florida
  • Frank A. Chapman
    • Department of Fisheries and Aquatic SciencesUniversity of Florida
Article

DOI: 10.1007/s10228-004-0257-z

Cite this article as:
Kim, D., Nam, Y., Noh, J. et al. Ichthyol Res (2005) 52: 94. doi:10.1007/s10228-004-0257-z

Abstract

The shortnose sturgeon Acipenser brevirostrum was revealed to have a larger number of chromosomes than previously reported for other sturgeon species. Its chromosome number ranged from 362 to 372 (of ten specimens examined), showing intraindividual variation. The karyotype of metaphase with the highest chromosome number (372) consisted of 89 pairs of macrochromosomes and 97 pairs of microchromosomes (fundamental number; NF = 550). Although the microchromosomes were relatively shorter than the macrochromosomes, most of them had discernible arms and centromeres. Silver-stained nucleolar organizer regions (Ag-NORs) were localized on the telomeric regions of 5 pairs of chromosomes (Ag-NORs = 10): 4 were made up of small meta/submetacentrics and 1 of acrocentrics. Polyploidy of A. brevirostrum should be hexaploid based on the karyotype, numerous chromosomes, Ag-NORs, and previously reported large genome size (ca. 13 pg DNA/cell).

Key words

Shortnose sturgeonAcipenser brevirostrumChromosome numberAg-NORs

Supplementary material

A color version of silver-stained metaphase of Acipenser brevirostrum (Fig. S1) is available on Springer’s server at springerlink.com

Copyright information

© The Ichthyological Society of Japan 2005