Oxynoemacheilus merga, Krynicki's loach, is a species of stone loach from the genus Oxynoemacheilus. This species reaches a length of . It is found in the western drainage basin of the Caspian Sea in eastern Europe in the upper mountain streams of the drainage systems of the Kuma, Terek, Sulak, Shura-ozen and Samur where it is abundant. The countries in which it occurs are Azerbaijan, Georgia and Russia. References Kottelat, M. and J. Freyhof, 2007. Handbook of European freshwater fishes. Publications Kottelat, Cornol and Freyhof, Berlin. 646 pp. merga Taxa named by Johann Krynicki Fish described in 1840 Fish of Europe