46 



99 feet and over. The upper graph shows that 

 single-rig ves s e Is used more 60-foot and 

 smaller nets in 1964 than in 1963. 



Data on shrimp vessel main-engine horse- 

 power are available only for 1964 and are not 

 classified by type of rig. The predonainant 

 horsepower preference is 150 to 199 (fig. 6). 

 A comparison of figures 3,4, and 6 indicates 

 poor correlation between horsepower, vessel 

 length, and gross tonnage. The reason for 

 this discrepancy may be that vessel owners 

 prefer certain model engines that are avail- 

 able only in specific horsepower. This pref- 

 erence may account for the fact that many ves - 

 sels, over and under typical characteristics 

 (shown in opposite column), are overpowered 

 and others underpowered (Juhl, 1961). 



Using data showing certain vessel modal 

 measurements and characteristics, a typical 



Gulf of Mexico double-rig shrimp vessel may 

 be described as follows: 



Gross tonnage 42-45 



LOA 55-60 feet 



Main engine 200 hp. 



Trawl net size footrope 



2 nets combined 90 feet 



The present trend, however, is toward 

 larger vessels in the 65- to 75 -foot class, of 

 60- to 80-gross tons, and to main engines of 

 275 to 300 horsepower. Steel-hull construc- 

 tion is rapidly gaining acceptance, although 

 wood is still preferred by most boatyards. 



In addition, there is a trend to design and 

 construct larger vessels, 80 feet and over, for 

 multipurpose use --as offshore oil rigtenders 

 and survey platforms, and for fish trawling, 

 line fishing, and shrimp trawling in distant 

 waters. 



UTERATURE OTED 



SPRINGER, STEWART 



1951. Expansion of the Gulf of Mexico Shrimp Fishery. Com- 

 mercial Fisheries Review, vol, 13, no. 9 (Septem- 

 ber), pp. 1-7. 



, and HARVEY R. BULUS, Jr. 



1954. Exploratory ShrimpFishing in the Gulf of Mexico, Sum- 

 mary Report for 1952-54. Commercial Fisheries Re- 

 view, vol. 16, no. 10 (October), pp. 1-16. (Also 

 Sep. 380.) 



ANDERSON, WILUAMW. 



1958. The Shrimp and the Shrimp Industry of the Southern 



United States. U.S. Fish and Wildlife Service, Fish- 

 ery Leaflet No. 472, pp. 1-10. 



KNAKE, BORIS O.j JAMES F. MURDOCKj and JAMES P. GATING 



1959. Double -Rig Shrimp Trawling in the Gulf of Mexico, 



U.S. Fish and Wildlife Service, Fishery Leaflet No. 

 470, pp. 1-12. 



JUHL, ROLF 



1961. A Study of Vessel and Gear Usage in the Shrimp Fishery 

 of Southern United States. Commercial Fisheries Re- 

 view, vol. 23, no. 8 (August), pp. 1-9, (Also Sep. 

 624.) 



RINGHAVER, L, C. 



1960, Design and Mass Production of Shrimp Trawlers. Fish- 

 ing Boats of the World:2. Fishing News (Books) Ltd., 

 Ludgate House, London, pp, 615-621, 



LYLES, CHARLES H. 



1963. Fishery Statistics of the United States. Bureau of Com- 

 mercial Fisheries, Statistical Digest No, 57. 



1964, 



Fishery Statistics of the United States, Bureau of Com- 

 mercial Fisheries, Statistical Digest No, 58, 



Unpublished Statistical Data for 1963 and 1964. Bureau 

 of Commercial Fisheries, 



Created in 1849, the Department of the Inter! or-- a deportment of conservation— is concerned with 

 the management, conservation, and development of the Nation's water, fish, wildlife, mineral, forest, 

 ond pork and recreational resources. It also has major responsibilities for Indian and Territorial 

 affairs. 



As the Nation's principal conservation agency, the Department works to assure that nonre- 

 newable resources ore developed and used wisely, that pork and recreational resources are con- 

 served for the future, and that renewable resources moke their full contribution to the progress, 

 prosperity, and security of the United States—now and in the future. 



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