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U.S. BUREAU OF FISHERIES 



Common and scientific names of the commercial fishery -products caught in the United 

 States and Alaska — Continued 



STATISTICAL SURVEY PROCEDURE 



METHODS OF COLLECTION 



In order that persons using the statistics in this report may judge 

 as to their completeness and authenticity, there follows an outline of 

 the methods employed by the Bureau in collecting fishery statistics. 

 It will be noted that several methods are used. Each method has been 

 carefully studied to obtain the best results with the available personnel. 



General fishery statistics. — In the collection of general fishery statis- 

 tics, data are usually obtained on the catch of fishery products and its 

 value as landed by the fishermen, the quantity or number of each kind 

 of gear used, the number of fishing boats, the number and net tonnage 

 of fishing and transporting vessels, the number of wholesale establish- 

 ments, the amount of wages and salaries paid in these establishments, 

 the quantity and value of products prepared, and the number of 

 persons engaged in each phase of the industry. 



The scope of the coastal surveys includes the commercial fisheries 

 of the oceans, bays, and coastal rivers as far inland as commercial 

 fishing is important. This usually coincides with the range of commer- 

 cial fishing for anadromous species. Statistics of the fisheries of the 

 Mississippi River include the fisheries of the Mississippi River proper, 

 as well as all tributaries wherein commercial fishing for either fish, 

 crustaceans, or mollusks is prosecuted. Statistics of the lake fisheries 

 include those prosecuted in the Great Lakes, adjacent bays, and the 

 international lakes of northern Minnesota, as well as certain rivers 

 having outlets into these waters. 



