58 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



nets in northern and southern areas of the lake 

 could not be compared because no fish of year 

 classes 1944-46 were caught in large-mesh nets. 

 Those caught in small-mesh nets were consider- 

 ably smaller than both marked and unmarked lake 

 trout caught in these nets in northern waters. 



Lake trout that had lived in Lake Michigan 

 before the sea lampreys became numerous were 

 larger and had grown at a faster rate than the 

 marked fish. Two samples of lake trout of these 

 early year classes from the southern part of the 

 lake, caught in 1947 by large-mesh nets were so 

 similar they are believed to have been drawn from 

 the same population, but one that differed from 

 the northern population by an important char- 

 acteristic. Growth during the first summer to 

 formation of the 0-mark was much less than for 

 fish in the more northern waters. Subsequent 

 annual growth in length was the same in both 

 areas. 



LITERATURE CITED 



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1952. Use of electricity in the control of sea lam- 



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1955. The Sea Lamprey. Sci. Amer., vol. 192, No. 

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1951. Validation of the use of scales of brook trout, 

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1945. A biological survey of Moosehead Lake and 

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