Abstract
Micropogonias furnieri ( white croaker) is a demersal sciaenid species highly exploited along the south-eastern coast of South America. Off the Brazilian Coast some morphological and population dynamic characters suggested the presence of two partially isolated populations between 23°S and 33°S latitude. To study the white croaker population structure in this area, 17 enzyme and one protein-encoding loci were examined by starch and polyacrylamide gel electrophoresis in seven sampling sites for a total of 638 individuals. The allozyme results showed a high degree of genetic homogeneity in allele frequencies ( F st=0.005) and also high levels of gene flow were found among the sampled populations. Therefore, the results do not support the hypothesis of the presence of two partially isolated populations of the white croaker in the studied area.
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