FISHES OF MINNESOTA 47 



Genus CRISTIVOMER Gill & Jordan. 



Cristivonier naniaycusli (Wallbaum). Great Lake Trout. Mackinaw Trout. 



The color varies from almost white to gray and very nearly 

 black; round light spots everywhere on the body; wavy lines on 

 the head; a network of light and dark colors on the dorsal and 

 caudal fins. Body elongate; head very long, flattened above; 

 mouth very large, maxillary bone extending beyond the eye, nearly 

 half as long as the head; teeth strong. Head contained 4^ times 

 in the length. Depth 4. Eye large, contained 4-| times in the head. 

 Dorsal fin with 11 rays. Anal 11. Caudal fin deeply forked; adi- 

 pose fin small. Lateral line with 185 to 205 scales. Branchiostegal 

 rays 11 or 12. The average length is 17 to 36 inches, although 

 specimens have been taken that are much longer. Immense num- 

 bers are taken annually in Lake Superior, and it is quite common 

 in some of the smaller lakes. A specimen taken in Pokegama Lake 

 near Grand Rapids by H. D. Powers in August, 1895, weighed a lit- 

 tle more than 25 pounds and measured 42 inches, total length. A 

 half-tone cut showing this specimen is given on the first page of the 

 cover of Recreation for January, 1896, and in the same number will 

 be found a note, page 61, concerning its capture. 

 Cristivonier namaycush siscowet (Agassiz). Siscowet. 



The skin very much thicker than in C. namaycush; scales smaller, 

 175 in the lateral line; teeth weaker; supplemental maximillary 

 bone broader and shorter; head shorter and the flesh of the entire 

 body with much more fat. Mouth very large; caudal fin well forked;, 

 maxillary a little more than half the length of the head. Colora- 

 tion the same as G. numaycush. 



This fish is known only from Lake Superior, where it is com- 

 mon. It was first described from there as Salmo siscowet Agassiz, 

 Lake Superior, 333, 1850. It is taken at most of the fishing stations 

 on the lake, but is not as abundant as G. namaycush. 



Genus SALTELINUS (Nilsson) Richardson. 

 Salvelinus fontinalis (Mitchill). Brook Trout. Speckled Trout. 



Back mottled with olive or black; sides with many red spots 

 when alive, these fading to white in alcoholic specimens; dorsal 

 and caudal fins mottled with dark bands or spots; lower fins dark 

 shaded; belly in the males sometimes red. Body oblong, only mod- 

 erately compressed, back not much elevated. Head large, snout 

 blunt; mouth large; maxillary reaching beyond the eye; eye large. 



