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BLACK RIVER 



MACKINAW CO, MICHIGAN 



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Jim i^-i i " ' ' 



U. 2S 301 5 10 II 20 2S 30 I S 10 15 20 25 101 1 10 II 20 21 30 I 5 » 15 20 21 



21 301 1 



Figure 7 -"Number of sea lampreys taicen each day during 19?0 season 

 In five streams in different geographic latitudes, with mean 

 stream water temperatures for period. 



