Blackburn, M. 1960. Analysis of tuna availability in 

 relation to oceanographic variables. Iji M. Black- 

 burn (editor), Scripps Tuna Oceanographic Research 

 (STOR) Program - Quarterly Progress Report No. 10. 

 Univ. Calif. SIO Ref. (60-15) :8-9. 



Tuna distributions correlated with tempera- 

 ture. Tuna were displaced poleward of normal 

 distributions in the warm years 1957-58. 



KEY WORDS: tuna, temperature, distribution. 



Blackburn, M. 1960. Tuna ecology. l£ M. Blackburn 

 (editor), Scripps Tuna Oceanographic Research 

 (STOR) Program - Final Report. June 21, 1957-June 

 30, 1960. Univ. Calif. SIO Ref. 60-50:65-71. 



Isotherms of 20 and 21 C coincided with 

 yellowfin and skipjack distributions off Baja 

 California for the 1951 to 1959 period. 

 Zooplankton did not relate well with tuna 

 distributions. Skipjack avoided temperatures 

 over 28 C. Yellowfin seemed to aggregate on 

 food . 



KEY WORDS: tuna, yellowfin, skipjack, tem- 

 perature, food, distribution. 



Blackburn, M. 1961. Tuna ecology. Jn M. Blackburn 



(editor), Scripps Tuna Oceanography Research 



(STOR) Program - Report for the Year. July 1, 



1960 - June 30, 1961. Univ. Calif. SIO Ref. 

 61-26:29-33. 



Correlation analyses of tuna abundance and 

 zooplankton and micronekton abundance and 

 surface temperature. Within the temperature- 

 controlled limits of distribution the abun- 

 dance of tunas was determined by the abun- 

 dance of the biota in their food chain, and 

 not by temperature. 



KEY WORDS: tuna, temperature, food, distri- 

 bution. 



11 



