Abstract
Morphological and molecular genetic analyses of the Aipenser gueldenstaedtii sensu Berg (1934) were accomplished using individuals collected in the southern part of the Caspian Sea. The distribution of specimens in the space of principal components were calculated using 28 morphometric characters. The results demonstrated the absence of separate clusters. Frequency distributions of six of the studied meristic characters were unimodal and did not reveal the existence of morphologically distinguishable forms within the analyzed sample. The molecular genetic analysis on polymorphism, based on D-loop and partial sequences of adjacent tRNA genes (total length about 956 bp) of the same samples demonstrated high homogeneity. Combining the results of morphological and molecular genetic studies of the Aipenser gueldenstaedtii sensu Berg (1934) do not support the validity of the existence of Persian sturgeon as a separate species Acipenser persicus.
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