19k7 



Lake Superior and tributaries . — An immature adult^ 19.3 inches 

 long, was taken in May, h miles offshore in Grand Traverse 

 Bay^, east side of Keweenaw Peninsula; attached to lake trout 

 cau^t trolling; identified by V. C. Applegate, 



Tributaries of all basins . — Sea lamprey spawning runs were veri- 

 fied in~7li Michigan streams and reliably reported in 9 

 additional streams; see subsequent discussion. 



19U8 



Lake Superior and tributaries . — A sexually maturing adult, 16,0 

 inches long, was taken on May 31^ 19U8, by Rino Merila, 

 fisherman at Portage Entry, on a reef 10 miles north of 

 Pt. Abbay (Baraga County); specimen attached to a 6-pound 

 lake trout taken by hook in 12 fathoms of Tirater; identified 

 by V. Co Apple gate. Dr. Raymond E. Johnson of the Minnesota 

 Department of Conservation reported the taking of the first 

 sea lamprey in the Minnesota waters of Lake Superior. The 

 spread may now be termed completed. 



Tributaries of all basins. — Additional field investigations brought 

 the total spawning runs verified in Mchigan streams to 92 

 with sea lampreys reliably reported in 16 additional streams; 

 see subsequent discussion. 



III. The inventory of sea lamprey spawning streams 



As mentioned previously, a survey of sea lamprey spawning 

 streams was conducted in 19l;6 by Michigan Conservation Officers, 

 primarily by means of inquiry from commercial fisheiTnen. In all, 

 68 streams in Michigan were reported to have sea lamprey spawning 

 runs (Shetter, 19U9). 



With the advent of an intensive program of research on the 

 sea lamprey, the need was felt for more precise information on the 

 size and location of the spawning runs in Michigan waters. Further- 

 more, it was deemed advisable to have trained fishery biologists 

 verify the presence of sea lampreys since four native species of 

 lampreys occur in the same region. These could lead to numerous 

 false reports. 



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