1/ 



Table So^^Analysis of yellowfin tuna catch by depthi^' 

 stations 20 through 33j, Smith Cruj-sa 7o 



Hypothesis g The population of yellowfin tuna is homogeneously dis= 

 tributed with respect to depth, therefor© a 2§2sl ratio 

 is expected from hook groups Aj, B, and Go 



Conclusion g The significant X^ value cf eSol?":' (P<0o0l) indicates 

 that the data differ significantly from the expected 

 28231 ratiOj, thus the hypothesis given above is rejectedo 



u 



Arrangement of gears 3 floats per basket with 3 different lengths 



of dropperso See figure 4o 



2/ 



Hook arrangements? 



k% Shallow hocks (2 and 4},, S-fathom dropperso 



Bs Intermediate hooks (l and 5}j, 25'fathom droppers. 



Cg Deep hook (3), a 40=fathom droppero 



3/. 



Stations lumped to give minimum expected numbers of 5,, 



i/- 



The notations 4 and •**. indicate that the statistic is significant 

 at the 0,05 level and OoOl level respectivelyo 



28 



