FISHERY INDUSTRIES OF THE UNITED STATES, 193 7 451 



made by United States fishing vessels and those received by Seattle 

 wholeTale dealers. The landings credited to United States fishing 

 vessels are made by vessels operating distinctly as primary fishing 

 units, usuall}^ in the ofishore fisheries, while those credited as received 

 by wholesale dealers are usually products of the shore fisheries col- 

 lected mainly from points in Puget Sound and do not include fish 

 received from Alaska or Canada, or landings made by the halibut fleet. 

 Statistics of these landings at Seattle are released monthly and an- 

 nually in bulletin form and detailed data are published in the annual 

 reports of this Division. Statistics of the landings by fishing vessels 

 at Seattle have been collected since June 1915 and certain data on 

 products received b}^ Seattle wholesale dealers since December 1915. 



Statistics of the fishery products handled at the municipal wharf, 

 Washington, D. C, are reported to the Bureau by agents of the 

 Health Department in Washington. They are not published in 

 bulletin form, but a summary of the year's activities is published in 

 the annual reports of the Division. Data on products handled at the 

 municipal wharf are available since 1921. 



Atlantic mackerel fishery. — Statistics on the catch by the Atlantic 

 mackerel fleet are obtained by combining the figures of mackerel 

 landed at Boston and Gloucester, Mass., and Portland, Maine, with 

 those obtained by Bureau agents, who in recent years have been 

 stationed at other Atlantic ports where mackerel are landed. These 

 agents obtain data on the volume of mackerel landed in a manner 

 similar to that used to obtain figures on the landings by fishing 

 vessels at the three New England ports. The figures include only 

 the catches made by purse seine and drift gill net craft and are not 

 -complete for craft of under 5 net tons' capacity using this type of gear. 

 Statistics of this fishery appear only in the annual reports of this 

 Division, although the landings at the principal New England ports 

 appear in the monthly and annual bulletins published for those ports. 

 Statistics of this fishery are available from 1905 to 1936, inclusive. 



Shad and alewife fisheries. — Owing to the importance of the Hudson 

 and Potomac Rivers in the production of shad, surveys for statistics 

 of the catch, value of the catch, and operating units are made annually. 

 On the Potomac River similar statistics also are obtained for the ale- 

 wife fishery. Much of the data required for these surveys are avail- 

 able from the State fishery agencies. 



Statistics of the shad and alewife fisheries are not published sepa- 

 rately in bulletin form, but a summary of the year's activities is 

 published in the annual reports of the Division. 



Statistics of the shad fishery of the Hudson River are available for 

 1896, 1897, 1898, 1901, 1904, 1910, and from 1915 to 1936, inclusive, 

 while data for the shad fishery of the Potomac River are available 

 for 1896, 1901, 1904, 1909, 1915, and from 1919 to 1936, inclusive. 

 Statistics of the alewife fishery of the Potomac River are available 

 for 1896, 1909, 1915, and from 1919 to 1936, inclusive. 



Pacific halibut fishery. — Statistics of the Pacific halibut fishery are 

 obtained by the Bureau's agent in Seattle, aided by Bureau representa- 

 tives in Alaska and the International Fisheries Commission. The 

 fleet classification has been arbitrarily applied by including in the 

 "Washington fleet" all United States and Alaska vessels that land 

 more than half of their catch in that State. All other United States 

 and Alaska vessels of the halibut fleet are included in the "Alaska 



