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Abstract
A genetic variability assessment of five samples of the sand goby Knipowitschia panizzae from Adriatic lagoons revealed the presence of two phosphoglucomutase loci suitable for population genetics studies. Previous biochemical investigations on the same species referred phosphoglucomutase data only to a single structural locus. The differential tissue expression of this enzyme system was tested in the eye, liver, mature ovary, and epiaxial muscle by starch gel electrophoresis. In particular, good electromorph resolution in the muscle and liver tissues was observed. Early expression during ontogenesis was demonstrated through the analysis of individuals of different age classes. Different levels of observed heterozygosity were found at the PGM‐1* (0.043–0.095) and PGM‐2@*0.355–0.576) loci in the five analysed samples.