Figure 5, — Sea lamprey, Petromyzon marinus. 



3. Petromyzon marinus Linnaeus, sea lamprey (fig. 5) 



Sea lampreys have been collected from 90 U.S. streams tributary to Lake Superior. Larval 

 sea lampreys have been collected from 78 of these streams. 



Sea lampreys are continuing to infest Lake Superior streams. Surveys during 1963 revealed 

 seven additional streams with sea lamprey ammocetes. 



Records by state and county: 



Michigan - Chippewa 1, 3, 4, 5, 7, 8, 11, 12, 14; Luce 17, 18, 19, 20; Alger 21, 22, 23, 24, 

 25, 26, 27, 28, 29, 31, 33, 34, 35, 36, 37, 38, 39; Marquette 40, 41, 44, 46, 47, 48, 49, 50, 51, 53; 

 Baraga 55, 56, 57, 60, 61; Houghton 64, 66, 68, 69, 70, 84, 85, 90, 91, 92; Keweenaw 72, 77, 

 81, 121; Ontonagon 94, 95, 96, 97, 99, 102, 103, 111, 112. 



Wisconsin- Ashland 131; Bayfield 134, 142, 143, 144, 147, 150, 151; Douglas 152, 153, 154, 

 155, 156. 



Minnesota - St. Louis 161; Lake 162, 163, 166, 167; Cook 169, 170, 174, 175. 



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