Table 14. --Yellowfin and bigeye tuna catch by relative hook depth, Cavalieri 

 cruise 1 



1/ Stations combined to give minimum expected catches of 5. 

 * Significant at the 0.05 level. 

 ** Significant at the 0.01 level. 



To further elucidate the depth distribution of tunas, some gear with 30-fathom float 

 lines and some with 2-fathom float lines was fished along with the regular gear having 10-fathom 

 float lines (table 17). There was little difference in the yellowfin catch among the three types 

 of gear, however, during this cruise there was also no significant difference in the catch of 

 yellowfin with relative depth within the regular gear. On the other hand, during each exi>eriment 

 the deepest fishing gear caught more bigeye (table 17), and during this cruise the bigeye were 

 t2Lken in greater numbers on the deeper hooks of the regular gear (table 13), 



25 



