When we compare the results of the Shonan Maru and the Shichi- 

 sei MarUj, a rather conspicuous difference between them appears j but 

 this probably results from a difference in the areas surveyed^ The 

 Shichisei Maru(l8) worked mainlv north of 24° No U9>) whereas the 

 ShSnan Maru operated between 20° and 24° o Hitherto it has been 

 said that among the tuxias the big-eyed tuna inhabits thie greatest 

 depthSs but the foregoing table tends to contradict this thesiso 



The following figures are data from the Celebes Sea area^ 



Table 9 



Fishing Situation at Various Depths 



ao Celebes Sea, Dec 1936 =■ Feb„ 1937 (Shonan Maru) 



Depth 

 Catch Rate 



45 



4o2 



68 

 lo7 



91 



2ol 



129 

 s q 



Notes Catch rates are totals for spearfishes and tunasc 

 bo Celebes Sea, Feb„ 1933 (Shorian Maru) 



Depth 

 Catch Rate 



23 



3o9 



90 

 7c 3 



113 



4c 7 



136 



5ol 



Note s Catch rate same as in (a.)„ 

 Celebes Sea, Aug„-Septo 1934 (Sh^ian Maru) 



do Celebes Sea, Aug„ 1934 (Shonan Maru) 



160 

 6o0 



Notes % in & ~ 6. indicates catch per 100 hookso 



___ _ _ =_ __________ — _ — __ —^ 



^ ' Former fisheries research vessel of Taihoku Province^ Formosa, 

 (19) Where there are many shoals and isletSo 



82 



