Table 4.— Analysis of yellov/fin tuna catch by depth!/, 

 stations 14, 15, 16, and 19j, Smith Cruise 7, 



Hypothesis ! 



Conclusions 



The population of yellowfin tuna is homogeneously dis- 

 tributed vri. th respect to depth, therefore a 2;2!l ratio 

 is expected from hook groups A, B, and C, 



The data do not differ significantly from the 2s2sl 

 ratioj thus the hypothesis given above is acceptedo 



1/ 



Arrangement of gears 5 floats per basket with 3 different lengths 



of dropperso See figure 4o 



-^Hook arrangements s 



As Shallow hooks (l and 5), 5-fathom dropperSo 



Bs Intermediate hooks (2 and 4), 25-fathom dropperso 



Cs Deep hook (3), a 40-fathom dropper, 



3/ 



-^ Stations lumped to give minimum expected numbers of 5. 



