ILLINOIS BIOLOGICAL 

 MONOGRAPHS 



Vol. XI January, 1927 No. 1 



AN ECOLOGICAL STUDY OF SOUTHERN 

 WISCONSIN FISHES 



The Brook Silversides (Labidesthes sicculus) and the Cisco 

 (Leucichthys artedi) in Their Relations to the Region 



» 



WITH 16 PLATES AND 27 TABLES 



I 



BY 



ALVIN ROBERT CAHN 



Price $1.50 



Published by the University os Illinois 



Under the Auspices of the Graduate School 



Urbana, Illinois 



