flSHEHY INDUSTRIES OF THE UNITED STATES. 



55 



1.20 per cent in the number of persons engaged, but an increase of 

 41.22 per cent in the amount of capital invested, and of 20.96 per 

 cent in the quantity, and 129.28 per cent in the value of the products. 

 There was considerable increase in nearly all of the more important 

 species except pike perch, lake trout, and yellow perch. The increase 

 in burbot, and possibly some of the other species, is, no doubt, due to 

 the work of the Bm^eau in encouraging the more extensive use as food 

 of species heretofore little used for that purpose. 



The following tables present by lakes the number of persons engaged, 

 the amount of capital invested, and the quantity and value of the 

 products of the fisheries of the Great Lakes in 1917, and also com- 

 parative statistics of the extent of these fisheries in various years 

 from 1880 to 1917: 



Persons Engaged, Investment, and Prodttcts of the Fisheries op the Great 



Lakes in 1917. 



' Includes St. Clair River. 



