July (Zo 36) and August (Zo40)o The Ceitch per hour for the three 

 months (2o 17) was less than that for the same three months in 1951 

 (3o20)o 



For tunny and yellowfiiHe the two species of tuna which we 

 have established in captivityp the catch per hour was higher in 1952 

 (Go 84 and 0o42) than in 1951 (0„40 and 0,31) for a comparable period. 

 For skipjack, however, the catch per hour in 1952 (OoSl) weis con- 

 siderably less than that in 1951 (l<,48)o 



Fishing was not continued after August 1, 1952, (except 

 for incidental trips) as the tank and pond were stocked with sufficient 

 fish for our purposeso 



Table lo--The number of fish caught^ fishing hours, and 

 catch per hour for the 1952 fishing operations 

 of the Salpa, with comparable data for 1951 



Catch 



per 

 hour 



ESTABLISHMENT OF TUNAS IN 

 CAPTIVITY 



Profiting by last year's experience, attempts were made 

 to establish only yellowfin and tunny in the concrete tank and in 

 Pond No o 5^ which were used successfully in 1951 (Tester 1952)o 

 The tank and pond are located on Coconut Islando 



Concrete Teink 



The concrete taJik, which nneasures 35x11x4 feet and 

 is supplied with running seawater by punnps, was modified slightly 

 by rounding the corners with sheets of Masonite and painting the 

 walls whiteo Despite these improvements only 2 out of 1 1 yellowfin 



