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. Unusual for gobies, this species is almost a fully pelagic fish. H. bergi grows to a length of SL. This species is also the only known member of its genus. The specific name honours the Soviet zoologist Lev Berg who described many new species of goby from the Caspian Sea.