CHARACTERISTICS OF 

 FISH POPULATIONS IN 

 UPPER MISSISSIPPI RIVER 

 BACKWATER AREAS 



Manne Bio^oeioal Laboreiory 



LIBRARY 



SEP 2 01965 



WOODS HOLE, MASS. 



UNITED STATES DEPARTMENT OF THE INTERIOR 



FISH AND WILDLIFE SERVICE 

 BUREAU OF SPORT FISHERIES AND WILDLIFE 



Circular 212 



