Table 6. — Mean v^ ater temperatur es , n umbe r and average len g th by sexes of samples 

 of sea la mpreys and tota l number of sea lampreys taken in Carp Greek 

 Pre s que Isle County , Mich* , by dates and by pe riods in 1950 



Males 



Female; 



Date 

 1950 



Mean water 

 tempera- 

 ture 



/t-.0\ 



A" 



Number Average 

 measured length 



(inches) 



Number Average 

 measured length 



(inches) 



Number not Total 

 measured number 

 taken 



April 26-May 2 (Weir operation continuous - no lampreys taken) 



May 3 

 4 

 5 



May 1-5 



May 



15 

 11-15 



43.0 

 41.0 

 43.0 



56.0 



1 

 2 



17.6 



• » • 



17.4 

 17.5 



2 



2 



19.0 

 19.0 



43 



16.7 



21 



16.9 



31 

 31 



3 



5 



31 

 95 



16 

 17 

 18 

 19 

 20 



May 16-20 



58.5 

 52.0 

 53.5 

 54.0 

 58.0 



7 

 1 



■ • • 



32 

 40 



17.9 



• o • 



17.6 



• ♦ • 



16.8 

 17.0 



24 

 38 



• • * 



46 



13 

 121 



37 

 38 

 21 

 46 

 151 

 293 



21 

 22 

 23 



24 



25 



May 21-25 



63.0 

 62.5 

 59.5 

 62.0 

 64.0 



23 

 15 



■ • • 



38 



17.7 



• • • 



16.4 



• • • 



17.2 



25 



• • • 



83 



• • * 



79 

 187 



25 

 96 



83 

 77 

 79 



360 



May 



26 

 27 

 28 

 29 



30 

 31 



26-31 



64.5 

 56.0 

 56.0 

 61.0 

 65.0 

 63.0 



20 



• • « 



6 



• • • 



6 



■ u a 



32 



16.6 



• • • 



17.7 



• • • 



16.6 



• • • 



16.8 



Continued next page 



45 

 32 



• • • 



12 

 89 



84 

 45 

 19 

 32 

 31 

 12 



223 



