Table 11. — Summary of chi -square analyses of bait return and catch by 

 kind of bait (sardine vs. squid), John R. Manning cruise 13 

 (based on data in table 31) 



1/ stations were combined to give expected values greater than 5. 



Although the catch of the blgeye tuna, Parathunnus sibi (Temminck and 

 Schlegel) , was small, the evidence--as given by significant total and pooled chl- 

 squares (P < 0.01) --suggests a preference for sardine over squid baits. Of a total 

 catch of 28 bigeye tuna, 22 were caught with sardine. The evidence for preference 

 is further strengthened by the total bait return of 981 sardines as compared to 

 1,290 squids. However, this conclusion should be taken with reservations in view 

 of the significant interaction between baits and the small catch of bigeye. 



Of a total catch of skipjack, Katsuwonus pelamis (Linnaeus), of 28 

 only 9 were taken on sardine baits. This is a reversal of the findings for bigeye 

 discussed above. However, the difference of 10 fish was not statistically 

 significant. 



12 



