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FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



equivocal sampling and projection techniques. 

 A system of interviewing trawler captains provides 

 the basis for acquiring this and other information. 

 The number of trawler captains each port agent 

 is able to interview, per week, may vary from none 

 to 25 or more depending on his other duties, the 

 likelihood of contacting captains during the hours 

 he can set aside for this purpose, and the coopera- 

 tion of the captains themselves. As time and 

 circumstances permit, landing sites are visited and 

 information concerning operations of their trawlers 

 is solicited from those captains who are on hand. 



Data on areas and depths fished as well as time 

 spent trawling at each fishing position are entered 

 on a "Report of Interview." Also sought are the 

 captain's observations of the number of other 

 craft that operated in the vicinity of his trawler 

 during its most recent trip. 



It is then assumed: (1) that all trawlers landing 

 at a given port operated in the same general area(s) 

 and at the same depths as those for which data 

 were secured by interview, and (2) that for all 

 craft, a simple linear relationsliip obtains between 

 amount of trawling time and size of corresponding 



Figure 5. — Unloading eatch of whole shrimp at a modern Gulf coast processing plant. Hopper (at far end of conveyor) 

 is lowered into vessel's hold and facilitates unloading. (Ice is removed by means of bath situated midway along the 

 conveyor which carries the shrimp to the processing facility.) 



