United States Department of the Interior, Douglas McKay, Secretary 

 Fish and Wildlife Service, Albert M. Day, Director 



FLUCTUATION IN TRAP NET CATCHES IN THE UPPER MISSISSIPPI RIVER 



By D. W. Kelley, Aquatic Biologist 

 Fisheries Research Unit, Minnesota Department of Conservation 



St. Paul, Minn. 



Special Scientific Reports Fisheries No. 101 



