The ichthyofauna of the Moksha River, a tributary of the Volga river basin, Russia Author Artaev, Oleg Author Ruchin, Alexander B. text Check List 2017 2017-07-28 13 4 185 202 http://dx.doi.org/10.15560/13.4.185 journal article 10.15560/13.4.185 1809-127X Carassius gibelio ( Bloch, 1782 ) , Prussian Carp. Cyprinus gibelio Bloch 1782: 71 . Carassius gibelio — Kottelat and Freyhof 2007: 145 . Carassius auratus gibelio — Reshetnikov et al. 2003a: 222 . Material examined. Table 1 . Presence of a concave border of dorsal fin and 37–52 gill rakers in first gill arch. This species used to be rarely captured in the 1960s ( Dushin 1967 ), but is more frequently found nowadays, when compared to the congener C. carassius . The Prussian carp avoids large rivers ( 101– 500 km from the source), as well as streaming oxbows. The occurrence in rivers farther than 100 km from the source is low, but abundant. The highest share in catches is recorded in landlocked oxbows and ponds; a high occurrence was observed in ponds and storage reservoirs. Chondrostoma variabile Yakovlev, 1870 , Volga Undermouth . Chondrostoma variabile Yakovlev 1870 — Kottelat and Freyhof 2007: 190 . Chondrostoma nasus — Reshetnikov et al. (2003a) : 235 , non C. nasus ( Linnaeus, 1758 ). Material examined. Table 1 . Presence of an arched mouth and 50–62 scales on lateral line. It is a frequent species, but rather abundant and was recorded only in rivers 101–500 km from the source.