Perryman and Lynn: Stock and school structure of Stenella coeruleoalba 



129 



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 O 



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in 

 rr 



35 

 30 

 25 

 20 

 15 

 10 



5 





 35 

 30 

 25 

 20 

 15  

 10 



5 





 35 

 30 

 25 

 20 

 15 

 10 



5 





 35 

 30 

 25 

 20 

 15 

 10 



5 





 35 

 JO 

 25 

 20 

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10 



5 





 35 

 30 

 25 

 20 

 15 



10 



5 





 35 

 30 

 25 

 20 ' 

 15 

 10 



5 







SCHOOL 1 



School Size - 79 

 No. Measured - 26 



J3- 



M, 



" i 



XL 



SCHOOL 2 



School Size - 222 

 No. Measured = 46 



-E3- 



SCHOOL 3 



School Size - 73 

 No Measured - 30 



n 



SCHOOL 5 



School Size - 87 

 No. Measured = 33 



rrm n i 



IT 



SCHOOL 7 



School Size - 25 

 No Measured = 9 



1 



" n 



100 120 140 160 18 



200 220 240 



SCHOOL 8 



School Size - 56 

 No Measured - 29 



SCHOOL 9 



School Size - 86 

 No. Measured - 54 



. rv r^V t 



Length 

 cated le 



LENGTH (CM) 



Figure 



frequencies for each school of striped dolphi 

 ngths of dolphins that were included in the 



SCHOOL 10 



School Size = 23 

 No Measured = 1 7 



SCHOOL 11 



School Size = 100 

 No. Measured - 10 



SCHOOL 12 



School Size - 54 

 No Measured = 29 



la 



SCHOOL 14 



School Size - 46 

 No Measured « 30 



ra , n , 



Jfl 





W 



& 



m_ 



100 120 140 



180 200 220 240 



LENGTH (CM) 

 8 



ns, Stenella coeruleoalba. Shaded bars indi 

 juvenile categeory. 



that is very similar to that reported from the west- 

 ern Pacific (Miyazaki, 1977; Miyazaki and 

 Nishiwaki, 1978). It also appears that the propor- 

 tion of smaller dolphins in our sample of schools is 

 not related to school size. Possibly this segregation 



is the explanation for differences between specimen 

 and photogrammetric data sets. 



Tuna fishermen select dolphin schools for encircle- 

 ment based mainly on the amount of tuna associ- 

 ated with the school. Schools of younger/smaller 



