M. Hara et al., Genetic differentiation of natural populations of the snake-head fish, Channa striatus in Thailand, FISHERIES S, 64(6), 1998, pp. 882-885
In order to estimate the genetic differentiation of natural populations of
the snake-head fish in Thailand, 12 enzymes were examined in 13 populations
collected from the north, the central, and the northeast region. Seventeen
enzyme loci were detected, and polymorphism at 6 loci was revealed. The ch
aracteristic frequencies of alleles were regionally observed at IDHP-2* and
MPI* locus. The genetic distances among populations within region were sma
ller than among populations of 3 regions. The average genetic distance amon
g populations between the north and the northeast region and between the ce
ntral and the northeast region were larger than that between the north and
the central region clearly. The populations could be divided into 2 groups
of the north-central and the northeast population on the basis of the dendr
ogram drawn by genetic distances. The genetic groups coincided with the geo
graphical groups divided by 2 large river systems in Thailand.