FISHERY INDUSTRIES OF THE UNITED STATES, 1 93 1 395 

 Lake fisheries of the United States, 1930 — Continued 



OPERATING UNITS OF LAKE HURON: By gear 



OPERATING UNITS OF LAKE MICHIGAN: ' By gear 



2 Includes operating units used in the mussel fisheries of streams tributary to Lakes Erie, Huron, and 

 Michigan. Those used in Lakes Erie and Huron were inconsiderable and are included herein to avoid 

 disclosure of private enterprise. 



