900 



800 



700 



Number 600 

 of 



^"" 500 

 4 00 

 300 

 200 

 100 



40-100 Tons 



,^!^ 



100-200 Tons 



'-.i^ 



/- 



over 500 loiif 



~-i — I — r 



1955 



-I — I — I — r- 



1 «(,(.) 



-L 1 1 IT 



1965 



Figure 2. — Trends in numbers of licensed distant sea skipjack-tuna craft by size 

 category. Data: (Japanese Tuna Fisheries Federation, 1969, p. 6). 



300 



275 



175 



75 

 68 



50 



38 



1965 



Figure 3. — Annual construction of skipjack-tuna craft over fifty gross 

 tons in size. Data for 1951-52 from (Masuda, 1963, p. 542). for 1963-67 

 from (Japanese Tuna Fisheries Federation, 1969, p. 9). 



151 



