The species list of fish of the Upper Oka basin is verified. Data on biology of rare species are presented (western brook
lamprey
Lampetra planeri, sterlet
Acipenser ruthenus, bystryanka
Alburnoides bipunctatus rossicus, asp
Aspius aspius, undermouth
Chondrostoma variabile, bitterling
Rhodeus sericeus, and fresh-water sculpin
Cottus gobio koshewnikowi). Their morphological characters, distribution in the Upper Oka basin relative abundances of these species, and its changes
during recent decades are also commented.
Original Russian Text © V.V. Korolyev, Yu.S. Reshetnikov, 2008, published in Voprosy Ikhtiologii, 2008, Vol. 48, No. 5, pp.
611–624.