Table 13. — Chi-square analysis of albacore catches by hook depths, 

 John R„ Manning Cruise 11. 



Hypothesis; The population of albacore tuna is homogeneously distributed 

 with respect to depth; therefore a lslsl ratio is expected 

 from the three depth zones. 



Conclusions ; There is a definite difference of catch with depth, with 

 the lowermost hooks catching more,, This is indicated by 

 the significant individual, total and pooled ?t 2 ' s and by a 

 very low non-significant interaction Xr° 



-> Stations lumped to give minimum expected numbers of aboi 

 ** indicates a highly significant (P<0.01) chi-square value. 



22 



