GREAT LAKES FISHERIES 



SECTIONAL SUMMARIES 



SUMMARY OF U.S. OPERATING UNITS AND 



FISHING EFFORT, BY LAKES, 1970 



309 



NOTE:— THE NUMBER OF DAYS INDICATES THAT FISHING OCCURRED REGARDLESS OF THE AMOUNT OF TIME FISHED DURING A DAY. 

 THE NUMBER OF FISHERMEN AND CRAFT OPERATING AS REGULAR, PART-TIME, AND CASUAL IS BASED ON DAYS OF OPERATION AS 

 FOLLOWS: REGULAR--MORE THAN 161 DAYS, PART-TIME 54 TO 161 DAYS ! INCLUSIVE), AND CASUAL--LESS THAN 54 DAYS. 



