GULF OF MEXICO COMMERCIAL SHRIMP POPULATION'S 



355 



Table 4. — Commercial shrimp landings btj United Slates 

 trawlers, Gulf of Mexico, 1956-59 ' 



[Thousands of pounds] 



tV 



V.^Uf \ I 



-^.j£^^ 



4MLACMC0UI 



»:l|-.v.»CS5i-i-i ■.■ 4 »i I . f:*; .^<^Hv 



M ft 9> t T 



W 



KMSACOLA-yiSMSI^M NIVCK 



/•^ 



::5!4^.^,/£V:;:sk, 



U J 3 N 



• 3« - M 



trFowT 



I Breakdown of landings according to amounts taken seasonally from in- 

 shore and offshore waters is made in appendix tables 2-4. 



Figure 8. — Effort expenditure and commercial shrimp 

 landings by United States trawlers operating off the 

 United States Gulf coast, 1956-59. 



temporal components reveals, however, significant 

 fluctuations and trends within coastal units. For 

 instance, effort and total yield exhibited distinct 

 seasonal patterns in the Sanibel-Tortugas, Pensa- 

 cola-Mississippi River, Louisiana Coast, and 

 Texas Coast offshore areas. Total landings pe- 

 riodically dropped to unfavorable lows in the 

 Sanibel-Tortugas (1957, 1959), Pensacola-Missis- 

 sippi River (1958), and Louisiana Coast (1957) 

 areas (fig. 8); established a significant upwai'ti 

 trend in the Texas Coast area; and declined 

 appreciably over the 4-year period in the Obregon- 

 Campeche area. Annual effort expenditure and 

 yield were comparatively stable in the Apalachi- 

 cola area (figs. 8 and 9). Waters off the Texas 

 and Louisiana coasts ranked, in that order, as 

 top shrimp producers. 



643091 0—62- 



