Abstract
Genetic variability was studied by starch gel electrophoresis at 32 loci in 468 perch (Perca fluviatilis L.) from eight freshwater localities in Sweden, Ireland and Scotland, and five brackish water localities in the Baltic Sea. Only two loci (PGM, EST-1) showed genetic variability and the average heterozygosity (H=0.03%) is two orders of magnitude lower than the mean value for bony fishes (Nevo 1978, Theor. Pop. Biol. 13: 121–177; Smith and Fujio 1982, Mar. Biol. 69: 7–20). The consistency of the pattern in all samples indicates that almost complete lack of allozyme variability, among as well as within populations, is a species characteristic.
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