Journal of Comparative Physiology B

, Volume 171, Issue 5, pp 387–394

Distinguishing two types of gray mullet, Mugil cephalus L. (Mugiliformes: Mugilidae), by using glucose-6-phosphate isomerase (GPI) allozymes with special reference to enzyme activities

  •  C. Huang
  •  C. Weng
  •  S. Lee
Original Paper

DOI: 10.1007/s003600100187

Cite this article as:
Huang, C., Weng, C. & Lee, S. J Comp Physiol B (2001) 171: 387. doi:10.1007/s003600100187

Abstract.

The resident and migratory types of gray mullet, Mugil cephalus, on the coast of Taiwan can not be separated morphologically. Allozyme analysis was applied to estimate genetic variation between the two types of gray mullet and to test whether they belong to different populations. After starch gel electrophoresis, different allelic frequency spectra of glucose-6-phosphate isomerase-A (GPI-A) between stocks was observed. The resident stock contained Gpi-A(135) and Gpi-A(100), whereas the migratory type contained Gpi-A(100) only. In addition, GPI activities of locus A showed two distinct profiles between the two alleles. The results broadly revealed that Gpi-A allelic frequency was not regulated by temperature changes even after 6 months of thermal acclimation. This suggests that natural selection may play a role in shaping the allelic frequency change during the migratory journey. These findings suggest that the Gpi-A allelic difference can be used for population discrimination.

Phosphoglucose isomerase Natural selection Enzyme kinetic Allozyme electrophoresis Allelic polymorphism

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  C. Huang
    • 1
  •  C. Weng
    • 2
  •  S. Lee
    • 2
  1. 1.Department of Fisheries Sciences, Taiwan Ocean University, Keelung, Taiwan 200, Republic of China
  2. 2.Institute of Zoology, Academia Sinica, Nankang, Taipei, Taiwan 115, Republic of China