Six enzymes glucose 6 phosphate dehydrogenase (G6PD), xanthene de hydrogena
se (XDH), alcohol dehydrogenase (ADH), peroxidase (PO), lactate dehydrogena
se (LDH) and isocitric dehydrogenase (IDH) were examined to discover the ge
netic variation in Indian mackerel through polyacrylamide gel electrophores
is. A significant difference in allelic frequency at XDH locus was observed
between the Cochin and Thotapally populations. Thotapally stocks exhibited
a significant deviation (P<0.05) from Hardy weinberg equillibrium. The pro
portion of polymorph ic loci was 0.777. The coefficient of identity and the
genetic distance estimated were 0.9262 and 0.076 respectively.