N 



250 .. 

 200 ,. 



150 ■- 



100 •- 



50 -. 



a) ^rface 



fish 



- times 



*15 



■+■ 



—I H 



10 11 12 13 



Fig. la Distribution of number of cateiiss (f) and number of fish 

 caught (N) in relation to surface- temperatures (So) en the 

 tuna fishing grounds of the Northeastern Area from Jane to 

 December, 1930, 



o 



N 



b) catch depth 

 25 - 50ni 



100.- 



50-- 



— h 

 10 



~ times 



-.10 



li 12 13 i i':^ 2^ 1^ 1^' ^9 20 A <2 2b akoC 



-.5 



Fi 



ig.lb Distribution of number of catches (f) and number of tuna 

 caught (N) in relation to tamperatures (6) at the depths at 

 which fish ?vere taken (.25-50m) on the tuna fishing grounds 

 of the Northeastern Area from June to December, 1930 » 



o 



