520 



U. S. BUEEAU OF FISHERIES 



for 11 per cent of the catch and 11 per cent of the value. All these 

 rivers are tributary to Lake Michigan. 



The fisheries of the mussel-shell industry were prosecuted in 4 rivers 

 in Michigan, 4 in Wisconsin, 2 in Indiana, and 1 in both Michigan 

 and Indiana. Michigan accounted for 88 per cent of the total catch 

 and 91 per cent of the total value. Indiana accounted for 7 per cent 

 of the catch and 6 per cent of the value, and Wisconsin accounted for 

 5 per cent of the catch and 3 per cent of the value. 



BUTTON BLANK MANUFACTURING 



There were four establishments in the mussel-shell industry of the 

 Lake fisheries engaged in the manufacture of mussel-shell products 

 during 1929. They employed 42 persons, who received $37,218 in 

 salaries and wages. The products manufactured consisted of button 

 blanks, valued at $47,669, and miscellaneous products, valued at 

 $1,125. 



Mussel-shell industry of the Lake fisheries, 1929 



OPERATING UNITS 



1 1ncludes Maple and Thornapple Rivers, tributaries of Grand River. 



