550 



Memoir Sears Foundation for Marine Research 



end of the base of the rayed dorsal fin rather than under the midpoint of the base of the 

 dorsal, as in the Whitefishes. If a specimen of this family is taken anywhere along 

 the Atlantic coast of eastern North America and if it does not agree in detail with 

 the following illustration of the common Lake Whitefish (Fig. 1 30), it is probably a 

 Round Whitefish (genus Prosopium, p. 548). 



Description. As the Lake Whitefish is not a regular member of the saltwater fish 

 fauna anywhere on the Atlantic coast of North America, the accompanying illustration 

 seems sufficient for identification without detailed description. 



Figure 130. Coregonus clupeaformis, from Ecorse, Michigan, USNM 10300, after Goode. Drawn by 

 H. L. Todd. 



Subspecies. C. clupeaformis, like most of the coregonids, is extremely variable, so 

 much so that Koeltz, in his detailed study (5: 370-381), recognized seven subspecies, 

 four of which, c. clupeaformis (Mitchill) 18 18, c.stanleyi Kendall 1904, c. neo-hauto- 

 niensis (Prescott) 1851, and c. gulliveri Koeltz 1931, are reported for the Atlantic 

 watershed of eastern North America. Discussion of these would be out of place here, 

 for C. clupeaformis, so far as is known, occurs only as a stray in salt water in the 

 western North Atlantic, though it does occur more commonly in such situations in 

 Hudson Bay. 



Range in North America. Arctic coasts and drainage basins of Alaska and Canada, 

 including the Ungava region of northern Quebec, and southward generally to Nova 

 Scotia (see below), northern New England in general, northern and central New York, 

 south-central Ontario (Peterborough County), the Great Lakes region, northern 

 Manitoba, central and southern British Columbia and Montana, and to the Bristol Bay 

 drainage basin on the Bering Sea coast of Alaska. 



Occurrence in the Western North Atlantic. The only published record for a coregonid 

 of any sort in salt water on the Atlantic coast of North America is of two that were 



