268 U. S. BUREAU OF FISHERIES 
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 by 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 annval 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 1935, inclusive. 
Shad and aleurfe 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 1935, inclusive, 
while data for the shad fishery of the Potomac River are available 
for 1896, 1901, 1904, 1909, 1915, and from 1919 to 1935, inclusive. 
Statistics of the alewife fishery of the Potomac River are available 
for 1896, 1909, 1915, and from 1919 to 1935, 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 
fleet.””, Monthly and annual statistical bulletins are available on this 
fishery, being published along with the statistics of the landings of 
fishery products at Seattle, Wash., and detailed statistics are pub- 
lished in the annual reports of the Division. Statistics of the landings 
of halibut at Pacific coast ports have been collected since 1925. 
Canned fishery products and byproducts.—Beginning in 1921, the 
Bureau has made annual surveys for statistics of the canned fishery 
