FISHERY BULLETIN; VOL. 87, NO. 2, 1989 



Table 9.— ANOVA results comparing paired north versus south 

 R/f values for brown shrimp and pink shrimp by release state (TA 

 = Tamaulipas, TX = Texas). 



Tamaulipas. Previous mark-recapture studies in 

 Texas and Tamaulipas waters indicated southward 

 movement of brown shrimp and pink shrimp after 

 May-June 1979 and 1980 releases in areas adjoin- 

 ing the border (Sheridan et al. 1987). Analysis of 

 recaptures from those early experiments employed 

 different methods from that used in this paper. 

 First, recaptures "north", "within", and "south" 

 of the release sites were located in relatively large 

 areas delimited by one degree of latitude or longi- 

 tude and by 0-90 m depths, not 10 minute grids of 

 latitude and longitude; thus short-distance move- 

 ment was not included in the analyses. Second, 

 recaptures were standardized by landings within 

 these large areas, not by effort. Third, recaptures 

 and landings were accepted from the month of re- 

 lease through the month of last recapture, not dur- 

 ing a restricted time period, which tended to reduce 

 recaptures per unit landings values since >50% of 



Figure 8.— Distribution of fishing effort by 10-minute grids of latitude and longitude for 

 47 vessels fishing off Texas during 1 June-31 August 1986. Numbers in each grid are 

 percentages of total log book effort, where = <1% and a blank = no effort. 



308 



