Composition and Distribution of Caspian Fauna in the Light of Modern Data



The composition of the Caspian fauna is considered in the light of modern data. The number of autochthonous species known for the Caspian Sea has now reached 435 and the Caspian species in the Pontoazov basin and Lake Aral number 178 and 41 species, respectively, i. e. 25–30% more than stated in the lists in my previous review (1960, 1964). The distribution of the Caspian fauna outside the Caspian Sea is discussed and it is shown that the ranges of many species have diminised owing to unfavourable conditions. However, in some species, especially mysids, the ranges have become substantially larger on account of their artificial acclimatization.