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 (15 Beaks, 6 Stomachs) 



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ROSTRAL LENGTH (mm) 



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Figure 1. — Length frequency distributions of rostral 

 lengths of beaks of ommastrephid squids (type A, probably 

 Dosidiciis gigas) from stomachs of yellowfin tuna, spotted 

 porpoise, and spinner porpoise taken in a single-net haul 

 (Haul 2) in the eastern tropical Pacific. 



were much the same as for Haul 1, especially 

 in that cephalopods strongly dominated in both 

 volume and numbers. In this haul, however, 

 ommastrephids rather than onychoteuthids pre- 

 dominated. Though scanty, the numerical re- 

 sults for the spinner were also similar to those 

 for Haul 1. The relative squid volume was dis- 

 proportionately large because the fish were rep- 

 resented only by otoliths. The contents of the 

 tuna showed most overlap with those of the 

 spotted porpoise. A scombrid. Axxis sp., was 

 present in both. Cephalopods and epipelagic 

 fish were important in both. This overlap, how- 

 ever, was overshadowed by some striking dif- 

 ferences. The portunid crab Euphylax dovii 

 occurred in half the tuna stomachs and account- 

 ed for a fourth of the total volume but was 

 absent from the porpoise stomachs (both species). 

 Oiiykia and enoploteuthid squids each occurred 

 in about half the spotted porpoise stomachs but 

 were absent in the tuna. 



1083 



