132 THE FRESH-WATER FISHES OF EUROPE. 



The ground colour is silvery-white, becoming grey on the back, with 

 diffused pigment. The trunk and fins may be free from spots, or a row of 

 large brown spots may extend down the back and lateral line. The tail has 

 a dark border, and the dorsal fin may have a dark transverse baud in the 

 middle. This species is usually from three and a half to four and a half 

 inches long, occasionally reaching five inches. It is found in the Salzach, 

 in Austria, and in the Save and Idria, but was first found by Agassiz 

 in Bavaria, in the Iser. Its habits are similar to those of the Common 

 Gudgeon. 



