Tfeble 13.— Production of chubs, intensity of the chub 



fishery, and catch of chubs per unit effort in the 



Illinois waters of Lake Michigan, 1950-1953 



[Production in thousands of pounds; fishing effort in 



lifts of 10,000 linear feet of small-mesh gill nets, 



catch per unit effort in pounds] 



Year 



Productior 



Fishing! Catch per unit 

 effort i effort 



1950 

 1951 

 1952 

 1953 



1,305 

 822 



979 

 1,188 



1/ 



l/ Estimated from data for the last 8 months of 1950; the 

 catch per unit effort for the 8 months in 1950 was ad- 

 justed according to the ratio of the 8-mounth to the 

 12-month catch per unit effort in 1951-1953; this ad- 

 justed catch per lift was then divided into the 12- 

 month 1950 catch to obtain an estimate of total fishing 

 intensity 



33 



