CONTENTS 



Page 

 Introduction i 



Installation and operation of sea lamprey 



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Lake Michigan •ooo»»>>o»" oooaooooooooooooooo^oo.oo.o.. i> 



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Number, of lampreys -taken by control devices -»*<>..«...<> 6 

 Relative abundance of sea lampreys c.ooo»ooo.o<.oeoe<.oo 6 



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Other species of fish taken in the weirs and traps 



and degree of scarring among them „ . « „ » . © © . . . . . . . . . . © 9 



Some biological characteristics of the sea lamprey 



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Range in length and average size, of migrant adult 



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Characteristics of spawning runs and their response 

 to the several factors affecting them <> ill 



Variations in time and character of migration in 

 different streams of differing characteristics 



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Variations in the tine of migration in different 

 areas (latitudes) of the same lake and among 



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Movement and dispersion of a blocked spawning run 



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Evaluation of various types of mechanical control 



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List of common and scientific names of fishes 



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