Abstract
The extent of biochemical genetic variation in the Cape anchovy Engraulis capensis was estimated from starch-gel protein electrophoresis. The gene products of 31 protein-coding loci were identified and Mendelian polymorphisms were observed at 21 (68 per cent). Ten of these loci (32 per cent) had common-allele frequencies less than 0,95 and hence were useful for testing hypotheses of geographic stock structure. The average population heterozygosity, a measure of genetic variation, ranged from 0,110 to 0,128 and averaged 0,115 over samples from 31 locations. Cape anchovies and other clupeiform fishes appear, on average, to have higher levels of genetic variation than many other marine fishes. This may result from the large population sizes and weak population subdivision that characterize them.
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