Figure 1?. Number of sea lampreys talcen each day in the Carp 

 Creek weir between April 6 and July 18, 19h9, and 

 the mean water temperature and v^ater gauge read- 

 ings for this period 38 



Figure IS. Number of sea lampreys taken each day in the 



Ocqueoc River weir between March 31 and July 18, 



I9I1.9, and the mean water temperature and water 



gauge readings for this period 39 



Figure 19. Length-frequency diagrams for migratory sea lam- 

 preys taken in Carp Creek, Presque Isle County, 

 in 19li7 ^^ 



Figure 20. Vfeight-frequency diagrams for male and female sea 

 lampreys taken in the Carp Creek weir and trap in 

 19l;7 58 



Figure 21. Length-vreight relationship and range in weight at 

 given lengths of male sea lampreys taken in Carp 

 Creek and the Ocqueoc River 60 



Figure 22. Length-vreicht relationship of female sea lampreys 



talcen in Carp Creek and the Ocqueoc River 61 



Figure 23. Dissection of a ripe female sea lamprey shovang 



size, extent, and position of ovary 72 



Figure 2I4., Frequency distributions of ovum diameter measure- 

 ments made from samples taken from the anterior, 

 mid, and posterior sections of the same ovary ih 



Figure 25. Frequency distributions of ovum diameter measure- 

 ments from sea lampreys taken on successive dates . . 77 



Figure 26. Relationship betvreen the number of eggs produced 

 and the total length of the fish for seventy sea 

 lampreys , 80 



Figure 27. Relationship between the number of eggs produced 

 and the weight of the fish for seventy sea 

 lampreys 81 



Figure 20. L'ap of the Ocqueoc River watershed shovdng zones 

 and survey stations described in this study and 

 the spawning areas of the sea lamprey in the 

 watershed Qk 



Figure 29. Numbers of nests and sea lampreys on the spasming 

 grounds at certain stations on various dates 

 during the 19U3 spav/ning sea,5on, .,,.,....,. r 90 



