STATISTICAL SURVEY PROCEDURE 



455 



Beginning with 1962, only summary data have been shown on the number of fishing gear oper- 

 ated in the Great Lakes and the International Lakes of northern Minnesota. These data appear in 

 the General Review section of the Digest in the table "Summary of Operating Units." In detailed 

 operating unit tables for these lakes, the number and size of gear have been replaced by informa- 

 tion on the fishing effort expended in the operation of each gear. 



Publication of Data — Statistics on employment in the fisheries, craft and gear engaged, 

 quantity and value of catch, and certain data on industries related to the fisheries are summarized 

 according to geographic divisions and published in bulletin form as soon as possible after the 

 completion of each survey. Later, the figures, in more detail, are included in this statistical 

 report. 



Data on the operating units (fishermen, fishing craft, and gear) and catch by counties for the 

 Atlantic and Gulf States have been included in these annual statistical reports for the years from 

 1928 to 1938 except for 1932. These data have also been published in the digests for the years 

 1945, 1950, 1955, and 1960. County data were collected for the State In which surveys were 

 conducted during the years since 1938, except for Maryland. Between 1942 and 1959, only oper- 

 ating unit data by counties have been obtained for Maryland. Complete data were obtained for 

 1960. County data assembled for the years since 1938 which were not published In the Digest 

 are on file in the Washington Office of the Statistics and Market News Division. 



LOCAL AND SPECIAL SURVEYS 



Landings at Certain Massachusetts Ports — Detailed statistics are collected on 

 the landings of aquatic products by individual fishing craft at Boston, Gloucester, New Bedford, 

 Plymouth, Provincetown, and other Cape Cod ports. Data on the landings at Boston and Glouces- 

 ter have been collected annually since 1893. Information on landings at New Bedford has been 

 collected annually since 1938; and at Plymouth, Provincetown, and other Cape Cod ports since 

 1945. NMFS representatives are stationed at the principal ports. They obtain figures on the 

 quantity and value of fish landed dally by fishing craft, the dates of departure and arrival of the 

 craft, the gear used in their capture, the grounds from which the fish were taken, and other re- 

 lated information. The Service's Office of Resource Research cooperates in the collection of 

 these data. 



Statistics on landings at the above ports are released monthly and annually in bulletin form, 

 and summary data are published in the annual Statistical Digest. 



Shad and Alewife Fish-aries — Surveys for statistics on the catch, value of catch, 

 and operating units in the Hudson and Potomac River shad fisheries are made annually. On the 

 Potomac River, similar statistics are also obtained for the alewife fishery. Much of the data re- 

 quired for these surveys is available from the States' fishery agencies. 



Annual data on the shad and alewife fisheries are not published separately in bulletin form. 

 However, a summary is published in the Digest. 



Statistics on the Hudson River shad fishery are available for 1896, 1897, 1898, 1901, 1904, 

 1910, and continuously since 1915. Data for the Potomac River shad fisheryare available for 

 1896, 1901, 1904, 1909, 1915, from 1919 to 1942, inclusive, and continuously since 1944. Sta- 

 tistics on the Potomac River alewife fishery are available for 1896, 1909, 1915, from 1919 to 

 1942, inclusive, and continuously since 1944. 



Pacific Halibut Fishery — Statistics on the Pacific halibut fishery are obtained pri- 

 marily from the International Pacific Halibut Commission. Beginning with data for 1956, the fleet 

 classification of halibut craft was revised and vessels were credited in operating unit tables to 

 each district in which they landed fish; the only exception being the U.S. vessels landing at Prince 

 Rupert, British Columbia, are credited to Southeastern Alaska. Duplication of halibut craft which 



