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



Directional movement patterns of brown shrimp 

 and pink shrimp were influenced by species and 

 state (Table 6). The full three-factor model indicated 

 significant differences (P < 0.001) in the frequency 

 distributions of recaptures. Analysis of single fac- 

 tors indicated that recapture patterns based on sex 

 alone were not significantly different. The signifi- 

 cant species x state interaction could not be re- 

 solved further, since partitioning this interaction to 

 within-state or within-species components still 

 yielded significant differences in the distributions 

 of recapture frequencies (Table 6). Graphical presen- 

 tation of these analyses (Fig. 5) illustrated several 

 points: 1) pink shrimp tended to orient alongshore 

 (north and south) while brown shrimp had a strong 

 offshore component (NE-SE); 2) male shrimp and 



Table 6.— Analysis of adjusted directional movement 

 of recaptured brown stirimp and pink shrimp using con- 

 tingency tables. Directions were grouped into 45° divi- 

 sions of the compass (0-44°, 45-89°. etc.) except 

 where noted by an asteriskC) when 60° sectors were 

 formed (15-74°, 75-134°, etc.). 



Factors 



df 



D PINK SHRIMP 

 n=1947 



BROWN SHRIMP 

 n=1085 



v\ 



E SE S SW W NW N 



DIRECTIONAL GROUP 



SE S SW W NW N 



DIRECTIONAL GROUP 



PERCENTAGE OF RECAPTURES 

 SO 



N NE E SE S SW W NW N 



DIRECTIONAL GROUP 



N NE E SE S SW W NW N 

 DIRECTIONAL GROUPS 



Figure 5.— Comparison of adjusted compass headings of recaptured brown shrimp (B) and pink shrimp (P) released off Tamaulipas (TA) 

 and Texas (TX), where directional groups fall between compass points, n = number of recaptures. 1. Frequencies by species. II. Fre- 

 quencies by sex. III. Frequencies by state. IV. Frequencies by species x state interaction. 



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