126 



Fishery Bulletin 92(1), 1994 



samples from the northern region were generally a 

 few centimeters smaller than those from the south, 

 a pattern reported by Perrin et al. (1985). This level 

 of difference was less than we could detect given the 

 available sample and the variability of our data 



30 

 25 • 

 20 • 



S 15 H 



o 



10 - 



Northern Region 

 n = 202 



I I i I I 



M 



tk 



80 100 120 140 160 180 200 220 240 260 

 Length (cm) 



80 

 70 

 60 

 50 



40 

 30 

 20 

 10 



o 



Southern Region 

 n = 616 



': 



m 



n p-i r-f 



^=^ 



1 40 



160 180 200 

 Length (cm) 



Figure 3 



Distribution of lengths of striped dolphins, Stella 

 coeruleoalba, measured from the northern and 

 southern regions. 



(Table 2). With this length sample, it appears that 

 we can expect to detect differences between means 

 that differ by at least 4 cm. 



140 150 160 



180 190 200 

 Length (cm) 



210 220 230 240 



"Adult Females" 

 n = 63 



- Southern Region 



140 150 160 170 180 190 200 210 220 230 240 

 Length (cm) 



Figure 4 



Distribution of lengths of "adult females", defined 

 here as stroped dolphins, Stenella coeruleoalba, 

 closely associated with a calf, measured from the 

 northern and southern regions. 



