estimated to be more than ten thousand skipjack gathered into the bag of 

 the neto (Each fish weighed about 530 momme ^ 4.o38 lbSo_7) , These fish 

 ran about vvildlyj breaking countless large holes in the net, and by the time 

 the net was hauled in, most of them had eseapedo The iatch was /i.,100 

 fish weighing 2,173 kan (_ 11,911 IhBoJo The net was designed and operated 

 with the object of catching sardines, and consequently invited results of 

 this sorto 



(2) A catch of skipjack in a four=angled lift net / ystsude aTni_7 



This type of net is used in the Uwashima area for taking small mackerel- 

 scad, mackerel, jami . chirimen iriko „ and other small fisho It is 100 

 fathoms long and 25 fathoms wide and is a type of fixed gear Trtiich is 

 fastened to the bottomo Or.e f/ouM never dream of taking skipjack in it„ 

 The net was operated off Asobiko near Uwashima on August 10, 1934-, the first 

 day of the month in the lunar calendar, by a fleet consisting of a fishing 

 boat and three llght-boatSo 



The fishing boat used a 24=volt 120-watt underwater light, while the 

 light-boats used 16=volt 100-watt lights„ At first enormous quantities of 

 plankton assembled and in two to five minutes, ^ami gathered and swam 

 around under the lights^ Small mackerel- scad and mackerel began to flash 

 their white bellies, flyingfish cut straight across under the light, ribbon- 

 fish like silver snakes slid along the sides of the boats, and sardines, 

 squids, and balloonfish sivam about drunkenly„ At a depth of ten or more 

 fathoms, what appeareo to be bream were seen swimming,. After a while, 

 about ten fathoms deeper, large fish in numbers from several hundred to 

 over a thousand were seen to appear suddenly and then disappear. At 

 first they were taken for large mackerel-scadc As it grew later, the .laml 

 became densely concentrated around the lights where they swam about causing 

 small waves on the water. About 100 meters away, around the edge of the 

 lighted area, the splash of a leaping fish could be heard from time to 

 time„ The large fish which had shown themselves earlier were now swimming 

 slowly close -:& the light about 10 fathoms down„ At 2§00 A,M„, the light- 

 boats were crdered to close in and concentrate the fisho The fishermen 

 began to draw up the net slowly and gently „ Three hundred skipjack were 

 quite unexpectedly taken that night along with squid, mack erel= scad, j 

 mackerel, jamio and so forthc Other boats which fished that same night 

 using carbide lamps did not take any skip jack. 



There are two or three other examples of the use of fishing lights, 

 but if we consider them all together, we can arrive at the following two 

 explanations. 



(a) Skipjack seem to have a tendency to assemble around a light„ 



(b) The same result is arrived at by the skipjack's happening to gather 

 around the light in pursuit of the sardines which the light collects. In 

 other words, it is indicated that there may be a direct and an indirect 

 concentratior. of fish around the light. 



63 



