catch ratio was 6.3, which indicates that this ground is richer than No. 4-. 

 The fact that more big-eyed tuna were found than yellowfin is a singular 

 phenomenon. 



No. 6. This fishing ground is located about 125 miles SE of No. 5 or about 

 320 miles SSE of Truk and north of Greenwich. The ENS flow of the current 

 clearly indicates that it lies within the Equatorial Counter-current. 

 As in the case of No. 5, 50 baskets were used. In one set 68 yellowfin 

 and 3 black marlin were caught; this means a ratio of 23.7 and indicates 

 a good record. I believe that this catch ratio of 23.7 is almost an 

 epochal record for the Zuiho Mara. 



No. 7. This fishing ground is located about 90 miles S/E of Ponape 

 Island. A catch ratio of 5.3 indicates that it is a fairly good fishing 

 ground. Numerous big-eyed tuna were caught, but not one yellowfin was 

 taken. 



No. 3. This fishing ground is located about 125 miles SE of No. 7 or 

 about 210 miles SSE of Ponape. The southeasterly flow of the current 

 clearly indicates that it lies in the Equatorial Counter-current area. 

 Althougl the number of basket- used was reduced to 4-0, 4-5 yellowfin were 

 caught. The catch ratio of 19.2 indicates a rich fishing ground. 

 No. 9. This fishing ground is located about 120 miles E of Kusaie I. 

 This ground was tested during the vessel's voyage to Jaluit I. The 

 fishi-;^ grot w> z not as good as we expected. 



No. 10. This fishing ground is located about 130 miles S/E of Jaluit. 

 Tudgit: Prom the easterly flow of the current, it lies in the Equatorial 

 nti ""--current a~ ea. The number of baskets used was 30 or twice as 

 y . . fc] r "i us time. In one set v 3 yellowfin were caught. The 

 catcl itio of 13. 1 indicates that this ground abounds in fish. 



Summary 



■ survey was conducted on only eight selecte: 1 fishing grou 

 • e Lde> sea area (about 345,600 square miles) between 1/.6 

 170° E 1 bi • and between 2° md :>° N latitude. Exe] li 



shi 120 miles east of Kusaie I., which had a catch 



1.3 bl "h. :' ing grounds all showed catch, ratios greater 

 t ■ 5; IV, ~ Lg it was 23.7 percent. This fully proves that tun" occur 



iantly in this area. There is no doubt that the results of this 

 survey will c greatly to the development of the tuna fishing 



iniustry in the islands. 



re, if co isider - survey of the 



h ratios increased as we sail ito the lower latitudes, 

 we can • that othe: grounds can be found south 



of 2 J - . ■ ide. 



Th va i lity cf this assumption must be tested by a later survey, 



(January If.) 



(Ncta) On] LsheS are reec ■ id on the foil . ling table 



adet tfc ' "ading of types of fishes caught. Skipjack and sharks are 



1 



