30 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 

 Coregonus quadrilateralis, Richardson. 



(Round or frost whitefish) 



(Plate I, fig. 4) 



A few specimens have been taken in shallow water in the early summer and 

 later in the fall. It probably exists in numbers in the deeper water, but on account 

 of its comparatively small size and slender body it is not commonly taken in the 

 gill-nets. 



Length 14 inches. Body elongated, somewhat cylindrical. Depth 4-8 to 

 5. Head 4-9 to 5-3 in length of body. Eye 4-7 to 5-9. Snout 3-8 to 4-2 in 

 head. Maxillary from tip of snout 4 to 4-5 in head. Dorsal fin with 11 or 12 

 rays, anal with 10 or 11. Scales 9, 88 to 91, 7 or 8. About 32 or 34 rows of scales 

 in front of the dorsal fin. The sides of the body are silvery, the dorsal surface 

 darker, brownish or sometimes bluish. One specimen, a male taken in November, 

 has the sides with about 7 rows of weak tubercles. 



This fish is credited with the destruction of the eggs of trout and whitefish 

 during the spawning season, and the intestines of specimens taken in the fall do 

 contain fish eggs. The same statement, however, may be made with reference to the 

 lake whitefish, the fact being that both fish are bottom feeders, and in all proba- 

 bility they add to their ordinary diet the eggs of their own and other fishes when 

 occasion permits. 



Coregonus clupeaformis, Mitchill. 



(Labrador whitefish) 



(Plate I, fig. 3) 



Two kinds of large whitefishes, representing more or less separable species, 

 but perhaps only developmental types, occur in the Great Lakes, one of them, the 

 Labrador whitefish, or Musquaw River whitefish, having been recently recognised 

 by Jordan and Evermaim ('09) as the common whitefish of the lakes, excepting 

 Lake Erie. The other is the common whitefish of Lake Erie (C. albus). The for- 

 mer species is a more or less elongated fish, of elliptical outline, and rather large 

 and coarse head, the latter a pale, deep rather angular type, with small weak 

 head and high nuchal elevation. 



Specimens of the Georgian Bay whitefishes have been submitted to Dr. Ever- 

 mann, who pronounces them fairly typical specimens of C. clupeaformis. 



In the southern part of Georgian Bay there is a tendency on the part of fisher- 

 men to recognize two types of common whitefish, one being called the coarse- 

 scaled, shore or shoal whitefish, the other the deep-water whitefish. There are no 

 whitefish inshore in the summer, and those that appear on the inshore shoals in 

 November are recognized as shoal whitefish. The deep-water whitefish inhabits 



