The five small tunny were introduced at intervals from August 27 

 to September 2o They swam at a leisurely pace around the tank;, forming a 

 schoolo The first fish, introduced on August 27^ and three others introduced 

 on August 29 started feeding on September 1^ taking strips of tuna flesho 

 The fifth fish, introduced on September 2, started feeding the following 

 dayo They successfully Dursued and devoured a small school of iao which 

 was in the tanko Howeverj during pursuit, one tunny leaped clear of the 

 water and through the fence (before the chicken-wire screen was used)o It 

 was returned to the water, unharmed, by a member of our research jroup 

 who happened to be oresento Wo more live bait was placed in the tank for 

 fear that the fish would injure themselves m chasing them„ 



The five small tunny are still alive and in good condition at 

 the time of writing, and "they apparently stand a good chance of surviving 

 for an indefinite period^/ They are fed strips of tuna flesh,, dead iao ^ 

 and dead nehuo They no longer exhibit fear at the approach of an 

 observer, but mill around at his feet in anticipation of food, ■'Miile 

 feeding, they swim with great rapidity^ taking food at or near the surfaceo 

 They enter into active competition for food both with each other and with 

 the yellowfin tuna which is also present in the tanko During the period 

 of confinement, each is estimated to have gained about 1 pound in weights 



The eight yellowfin, which were introduced at intervals between 

 June 20 and August 30j, swam slowly and leisurely around the tank soon after 

 being placed in it. Two died after 24 hours, two after 36 hours, and one 

 after 60 hoursc None of these fish had commenced feedingj they died in 

 the same violent manner as described for the large tunny. One yellowfin 

 (about 5 pounds) caught on June 20, started feeding on strips of tuna flesh 

 on July 2, and is still alive at the time of writingo During its 4 months 

 in captivity it is estimated to have gained about 3 pounds in weightc Like 

 the small tunnyj it has become quite "tame" and anticipates food at the 

 approach of an observero It shows a distinct preference for tuna flesh 

 over dead iao or nehuc The remaining yellowfin (about 6 pounds) was caught; 

 on August 22 and started feeding on August 26o It became well established^, 

 usually swimming with and behaving similarly to the yellowfin just des- 

 cribed,, On September 4, however^, it was found dead outside the tank— 

 apnarently it had leaped out of the water and through the fence while 

 pursuing baitfisho The chicken-wire screen was installed at this timeo 



The five small tunny and the two yellowfin established in the 

 concrete tank were subjected to a series of stimuli-reaction experiments 

 by co-workerS;, the results of which will be reported at a later dateo 



■d Three tunny died on November 11-12, 1951, following a period of 

 cold, wet weather. 



14 



