Abstract

MERISTIC and morphometric characters have been the most commonly used traits in the investigation of races or sub-populations of fishes. The differences in such characters among various populations may be due to variation in genetic as well as environmental factors. However, the relative influence of these two factors is usually unknown1. Consequently, it would be advantageous to use gene-frequency data based on Mendelian characters, the expression of which may be considered not to be influenced by environmental variation.

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