304 THE FRESH-WATER FISHES OF EUROPE. 



gravelly, and streams run through them. The flesh is reddish, and highly 

 prized. The method of fishing varies in different lakes. In the Lake of 

 Hallstadt the fish lie in the shadow of a mountain, and if the weather is calm 

 and clear the fishermen follow them to their retreat, and draw their nets in the 

 day-time. The largest and heaviest specimens are caught in the colder months 

 at great depths on lines baited with small Perch, Rudd, or other species of 

 Leuciscus. 



Salmo lacnstris (WILLOUGHBY). The Lake Trout. 



D. 13, A. 11, P. 13, V. 9, C. 17. Scales : lat. line 120, trans. 2630. 



There is a Lake Trout found in Lake Constance, which is known as Sckweb- 

 forelle or Silberlachs. It has the head long, low, compressed, pointed, and 



Fig. 156. SALMO LACUSTRIS (WILLOUGHBY). 



rather small, with a slender body. The greatest height of the body is always 



equal to the length of the head, which is one-fifth of the total length. The 



IIT ~v ' in .^ eve is one-seventh of the length of the head, and twice its 



'^SsSL^&^Oev*^ 



diameter from the snout (Fig. 156). 

 Fig. 157. FRONT VIEW 

 OF VOMER OF SALMO The maxillary bone is much longer than the snout, 



strong, expanded behind, and in large fishes reaches well 

 beyond the hinder border of the orbit. The teeth are strong ; the vomer is 

 comparatively broad, with two somewhat irregular rows of teeth (Fig. 157). 

 The hinder margin of the pre-operculum is nearly parallel to that of the oper- 

 culum. The lower limb forms a very obtuse angle. The last gill-arch carries 

 seven to eight distant blunt rake-teeth, which are' usually shorter than in the 

 Austrian fish known as the May Trout. 



The dorsal profile rises in a flattened arch to the dorsal fin. The ventral 

 contour is less convex. The dorsal fin begins half-way down the length, and 

 is rather longer than high. The anal fin is considerably higher than long, 





