FISHERY INDUSTRIES OF THE UNITED STATES, 1930 549 



Statistics of the fishery products handled at the municipal wharf, 

 Washington, D. C, are' reported to the bureau daily by agents of 

 the city health department. These arc compiled on an annual basis. 

 They are not published in bulletin form, but a sunnnary of the year's 

 activities is published in the annual report of this division. 



Atlantic mackerel fishery . — Complete 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, Me., 

 with those obtained by agents who in recent years have been stationed 

 at other Atlantic ports where mackerel are landed. These agents 

 obtain data on each fare of mackerel landed, similar to the data 

 obtained on the landings by fishing vessels at the three New England 

 ports. Complete 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 b idle tins published 

 for those ports. 



Shad and alewife fisheries. — Due 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 annu- 

 ally. On the Potomac River similar statistics also are obtained for 

 the alewife fishery. The surveys are conducted by agents in a man- 

 ner similar to that employed in the collection of general fishery 

 statistics, except that probably more fishermen are interviewed as 

 great care is exercised to make these canvasses as accurate as possible. 



The State of New York obtains statistics for the fisheries of the 

 Hudson River that closely parallel those desired by the bureau for 

 this fishery, which alleviates the work on this river. Both Maryland 

 and Virginia issue licenses for fishing, which give a very satisfactory 

 list of fishermen for the agents surveying the Potomac River. 



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 report of this division. 



Sponge 7narket, Tarpon Springs. — A large proportion of the total 

 output of sponges in Florida is handled through the sponge exchange 

 at Tarpon Springs. In view of this, the bureau has arranged with 

 a representative of the exchange to furnish statistics of the quantity 

 and value of the sponges, by variety classification, handled through 

 it annually. Statistics of the quantity of sponges handled through 

 the exchange are not published in bulletin form, but a summary of 

 the year's activities is published in the annual reports of this division. 



Fisheries oj Lakes Pepin and Keokuk. — As a means of ascertaining 

 the effect of the Keokuk Dam upon the fisheries of the upper Missis- 

 sippi' River, annual statistics of the fisheries of Lakes Pepin and 

 Keokuk are obtained by personal surveys conducted by employees 

 of the bureau at the Fairport (Iowa) biological station and the La 

 Crosse (Wis.) fish-cultural station. Their methods are like those 

 employed in the general surveys. The statistics are not published in 

 bulletin form, but summaries of production appear in the annual 

 reports of this division. 



Fisheries of the Mississippi River. — Statistics on that portion of the 

 Mississippi River lying between Lakes Keokuk and Pepin are col- 

 lected as a part of the survey for the two lakes. Statistics covering 

 this production are not available in bulletin form but a summary 

 appears in this report. 



