west of Taninibar lo On July 11 at 0505 120 baskets of gear were set 

 in an ESE directiono It required 2 hours and 10 minutes to set the 

 lines, and the total ler-gth of the lines was lOoS miles ^ Tffhil® 

 patrolling the lines we boated § yellowfin and 1 big^eyedo Eight 

 hours were spent in hauling the lines j, and the total cateh was 14 

 yellowfinj, 2 big=eyed„ 1 albacorCj and 1 broadbillg 47 fish were 

 damaged by sharks and killer whales « Most of the yellowfin taken 

 were large ones over 130 cm in lengtho The catch rate was 2^5 

 without the shark-bitten fish,, or 9oO including themo 



In addition 31 hooks were broken off the lines sOp if this is 

 taken into consideration, the cateh rate should be further increased 

 in -view of fchi; amount of fish occurring in the ar^a.- A peciiliar 

 phenomena whieh should be noted in connection vnth this trial is the 

 fact thatj aside from the fish damaged by 8te.rkSf there were 40 fith 

 eaten by killer whales o The remains of fish eaten by killers differ 

 from those damaged by sharks o In the ease of the killers only th® 

 head of a hooked tuna is left^ and ths distinction is clear at a 

 glaneeo 



Fourth Trial 



The position of this fishing ground was 7® 05«Sp 130° SO'E., to 

 the west of Tanimbar lo On July 12 at noon 120 baskets were ^»% in 

 an BSE directiono About sight hours were required for setting the 

 lines g and the catch was 80 yellowfing 1 true oarlinp 1 sailfishp 

 1 big=eyed, and 4 sharkSj, with 18 fish damaged by sharks o In 

 addition 17 hooks were broken off th® lines „ The catch rate was 

 llo5 without the shark^bitten fish,, or 14o0 with themo Measurements 

 of th« yellowfin taken showed that th® greatest number fell within the 

 rang© of 130 em long (assumed to b© fish in their ninth yti&r), Th© 

 big-eyed tuna was about 153 cm longo Tllhen the yellowfin wer® gutted, 

 the gonads were examined, but all of them were found to b® insmatur© 

 with no distinguishable ova, 



Fifsh Trial 



Tha position of the fishing ground was 6^ 58 "S, 130® 38 «E, off 

 the w3st side of Tanimbar lo On July 13 at 0600 we set 185 baskets 

 of line in a NW directiono The ©xcessiT© weight of th© fish on the 

 lines sank the gear and it could not be hauled in with th© line=haul©r. 

 The attempt was made to haul it by manpower^ but in the end th© lines 

 parted and 50 baskets of gear was unavoidably losto A long time was 

 required to haul th© lines in^ the operation beginning at llbO and 

 being completed at 2350o It actually took 12 hours o 



Th© catch was 52 yellcwfin, 1 big=eyed/ 1 black marlin, 1 true 

 marlin„ and 5 sharkSj, with 10 more fish 8hark=-damaged and 10 hooks 

 torn off the llneo The catch rat© was 6o8 without th® shark-bitten 

 fishp and 8oO if they are includedo Sine*! it can be presumed that 

 there were many tuna hooked on th© 50 baskets which were lost, th© 

 catch rate should b© considered even higher o 



41= 



