Changes in Phenotype and Genotype of Austrian <Emphasis Type="BoldItalic">Salmo trutta</Emphasis> Populations during the Last Century

Synopsis We studied the phenotype and genotype of Austrian wild and hatchery Salmo trutta populations and compared with museum samples from the 19th century (1863--1909) using morphometric and genetic (RFLP of mtDNA) markers. We found significant differences between the populations from the 19th century, the current wild populations, and the hatchery populations in morphometric parameters (mainly shape of pectoral, ventral and anal fins) and the RFLP pattern of mtDNA. We could not find the typical phenotypes and genotypes from the 19th century in either of the current populations. This phenotypic and genotypic replacement is considered to be due to anthropogenic activities.