closed, their immediate reaction to any restriction, such as forc- 

 ing their head into the mesh of the net, is to open the funnel. 

 The net then catches them between the branchial "basket" and the 

 opened funnel. Subsequent "tailing" through innumerable meshes 

 of the net eliminates any chance of escape (Figure 13). 



It has been suggested that netting operations be attempted 

 in the Great Lakes proper to obtain specimens of sexually immature 

 adults and to test the possibility of a fishery for these individ- 

 uals. Although this method of capture was practical and productive 

 in Ocqueoc Lake where the concentration of individuals was abnor- 

 mally high in a small body of water, I believe it would be of little 

 or no value in the Great Lakes where the sexually immature, adult 

 populations are undoubtedly greatly dispersed. 



The second and most obvious concentration of migrating sea 

 lampreys in the Ocqueoc River system occurred at a series of three 

 falls located about one-third of the way upstream (T35N, R3E, 

 S.22). Two natural falls (Figures U and $), h,S and 6.0 feet high. 



Figure 13. — Sea lampreys captured in a gill net in Ocqueoc 

 Lake, June 25, 19li7. 



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