Figure 18. Acceptance of CAVALIERI longline tuna 

 for canning. The percentages indicated in the graph are based on 

 a sample of the catch which was tagged prior to unloading. In this 

 manner individual fish could be identified with their original 

 weights after the precooking operation, which is the stage when 

 the acceptability of fish is established. The sample consisted of 

 72 out of a total catch of 720 yellowfin. 



Figure 19. Variation in size of yellowfin along the 

 Equator. The data plotted in this figure were taken from length 

 measurements converted to v/eights according to a weight on 

 length regression. Included are lengths of 10, 048 yellowfin tuna 

 fronn equatorial survey catches distriouted as follows: 



Japanese mothership expeditions: POFI survey fishing: 



Figure 20. Known trans -Pacific distribution of yellow - 

 fin tuna . The geographical e:: c ; of the Japanese longline fishery 

 is based on published records of pre-war Japanese fishing activi- 

 ties, on data from POFI observers' records on Japanese mother- 

 ship expeditions from occupied Japan, and on gleanings from news- 

 paper and trade journal accounts of post-treaty Japanese fishing. 

 The outline indicating the area of American yellowfin and skipjack 

 fishery follows Godsil (1938 Calif. F. B. 51, figure 3). 



Figure 21. Bait resources in the central Pacific. 



Material of this figure and the text below it were drawn from June 

 andReintjes, 1953. 



Figure 22, Mic-v^-Jnter sampan fishing in Line Islands . 

 The sampan TRADEWIND with a crew of 10 nnen sailed fronn 



46 



