movinc durinc the hours of daylight. In view of the Generally 

 neeative response of upstreaTn migrants to light, I believe the 

 differences in our data may be attributed to the verj-- shallow 

 and more exposed character of both streams in their lower reaches 

 than farther upstream. The weir from which Shetter"s data were 

 draivn was located \vell upstream in a well-shaded area of the 

 watershed. 



Other species of fish taken in the wairs 



(1) Kinds and numbers 



In addition to the sea laiapreys taken in the Carp Creek weir 

 each year,, individuals or runs of as many as 18 other species of 

 fish and one other species of lamprey were taken as they migrated 

 upstream (Appendix D), The total number of fish taken Tfas 9.-583 

 in 19U7., 3h,6S6 in 19U8, and 29,8% in 19h9, Two silver lampreys 

 r ichthyomyzon unicuspis ) were trapped in 19U7 and seven appeared 

 in 19IJ.3. 



In the Ocqueoc Pdver in 19l;9, a total of 9,865 fish of 16 

 different species was captured moving upstream and 3,198 fish 

 of 16 species were talcen moving downstream (Appendix D), 



The bullc of the fish talien moving upstream in Carp Creek vras 

 composed of spaivning runs of the white suckers ( Catostomus £. 

 commersonnii ), smelt ( Osmerus m. mordax), lake chubs ( Couesius 

 plumbeus } , and Great Laltes longnose dace ( Rhinichthys c, cataractae ) , 



In the Ocqueoc River (in 19h9), the principal upstream runs 

 were of white suckers, golden redhorse suckers (lloxostoma aureolum), 

 and Great Lalces longnose dace. The principal do'vvnstream runs were 

 of yellow perch (Perca flavescens) and n/iiite and golden redhorse 

 suckers returning to the lake after spawning. 



(2) Times of migration 



The times of migration of other species of fish (Appendix D) 

 are significant insofar as some might represent potential compet- 

 itors of the sea lamprey for spawning grounds. Others (primarily 

 the minnow species) might be egg predators during the spawning 

 activities of the sea lampreys. No direct evidence of either 

 relationship has as yet been obtained, however^ since practically 

 all lampreys were removed from the streams in which the vreirs T/ere 

 operated. In the Ocqueoc River in 19U7 and 19li.3, the suckers 

 completed their spaiming activities prior to any extensive nesting 

 on the part of the sea lampreys which \Tould tend to eliminate 

 them as a competitor in this regard. 



-U9 - 



