ranged fr:>m 56 to 33 metorc and were commonly around 70 meters, hut the 

 depth appeared to make no greet difference in the C'?tch. A i^^f'-ph vins 

 drawn on the basis of these ''cheniiocl tube" depths to show the hyp'-th:-tic-l 

 depths of tho albacore hooks. An attempt to find tho water temperr.tures 

 near those ho:ks from the measured vertical distributi.jn of temperatures 

 gives the follcwin?; results: 



/ A table is inserted here; sec next paje of transl';ti:;n._/ 



Judging from these data the most fish arc taken in raters of 3"* to 13'^ 

 temper-" ture, and it can bo seen that the albacro's habitat covers waters 

 of rather low temperature. (See appended tables) 



c. Fishing methods 



On the third and fourth criaisos, \ih5n a].baccre were taken, most of 

 the fish were caught on longlinos. Pole fishinr was tried only t^ro tim.es 

 on the fourth cruise (taking llA and 16 fish). The trolling lines t'^ok 

 18 fish on October 11 and U fish on the 13th. In the or^i-vi^^us yoar's 

 investigations live bait '.7as carried, but this year, in order t- increase 

 the ice-carrying capacity, n'-nc '.vas taken clrng. Salted sardines t-rere 

 adequate for pole fishing, but it is thought that better results ivould 

 have been obtained \7ith live bait. 



d. Fishing grounds 



It would be of iTroat value in fishing if it were possible to have a 

 knowledge of oceanograohic conditions on the fishin;: grounds throu._h-ut 

 the whole operating period. Therefore it is th'~ught t?'.at it :v-~uld be of 

 great benefit to the planning of operations if urrangoments C'--.;l"l be 

 made to have each vessel enter detailed n.-tcs C' ncorning the surface Hater 

 tempieratures on its track chart fi~r each cruise, appendin,^ a table of 

 observations, an", transmit this infornaticn rapidly to the fisf.crics 

 experiment stations of each of the cooperating prefectures. 



e. Fishing seasons 



The period from May to October in which this year's survey v;as car- 

 ried out is suitable, but if possible it wuid be desirable to start 

 out in April s-^ that the bo'ts could bo on the fishin- ,_rr.unds inthe 

 early part of May. The necessity f^r this is seen in the fact that even 

 in iirea III the Musashi Maru and the Sagami r.!aru took a fair number of 

 albaccre in May. These arc cr nsidered t^ be the remnants of the -^vinter 

 albacore, but it appears necessary to investigate the migration.? of the 

 albacore during the period bct\/een the ra.ntor season and Eay. 



In the course of the Kamui Main's operations in the middle of October 

 it appeared from the fish theirisolvcs and from, the oceanographic condi- 

 tions that the fish taken in tho first part of the operations ■.■/ere summer 

 albacore while tlios.; taken in the latter oart of the cruise when the vessel 

 moved farther southward were vdnter albacore. For example, the fish 

 taken in the first part of the operations wore small (it may be prem.aturc 

 to judge that all small fish arc su'^-mor albacore, however, this is assumed 



