FISHP:RY IKDUSTRTES OF THE UNITED STATES^ 1923 



315 



MUSSEL FISHERIES OP RIVERS TRIBUTARY TO LAKE MICHIGAN 



In 1922 the mussel fisheries of rivers tributary to Lake Michigan 

 were found to be of sufiicient importance to be canvassed in connec- 

 tion with the Great Lakes canvass. Though not formerly canvassed 

 with the Great Lakes, earlier statistics on certain of the rivers are 

 available as the result of a special mussel canvass for the year 1913. 

 In order to avoid confusion in comparisons, the statistics of the 

 mussel fishery have been omitted from the foregoing treatment of 

 the fisheries of Lake Michigan and are shown in the following 

 table : 



Persons engaged, investment, and products in the mussel fisheries of rivers tributary 

 to Lake Michigan in 1922, by apparatus, States, and counties 



Note — The mussel fisheries on the above rivers have not previously been shown with Great Lakes 

 statistics, but those of some of them were shown in an independent mussel canvass for the year 1913. 



