Abstract
1. 1. Ten phenotypes of phosphoglucomutase (PGM), were detected in abdominal muscle extracts from white shrimp ( Penaeus setiferus) by starch-gel electrophoresis. 2. 2. The assumption that these phenotypes were under the control of five allelic genes was supported by the observed distribution of the phenotypes. 3. 3. There were no significant differences in PGM phenotype distribution between sexes or among samples of shrimp collected from Matagorda and Galveston Bays, Texas; Rockefeller Refuge and Barataria Bay, Louisiana; and the north Edisto River, South Carolina. 4. 4. The five PGM alleles observed in white and brown shrimp appear to be the same in the two species. 5. 5. Comparisons of PGM phenotype distributions and allele frequencies of white and brown shrimp suggest that the two species are closely related.
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