Volga dwarf goby
Hyrcanogobius bergi, the Volga dwarf goby, is a species of goby endemic to the Caspian Sea where it occurs in fresh, brackish and marine waters along the coast. Unusually for gobies, this species is almost a pelagic fish. This species grows to a length of SL. This species is the only known member of its genus. The specific name honours the Soviet zoologist Lev Berg (1876-1950) who described many new species of goby from the Caspian Sea.