Blackburn, M. 1962. Tuna ecology. Di M. Blackburn 



(editor). Scripps Tuna Oceanography Research 



(STOR) Program - Half-yearly progress report No. 



1. Univ. Calif., SIO Ref. 62-14 (originally 



numbered as 62-50): 16. 



Influence of temperature on tuna abundance in 

 the Gulf of Tehuantepec. 



KEY WORDS: tuna, temperature, abundance. 



Blackburn, M. 1962. Tuna ecology. Iji M. Blackburn 

 ( ed i to r ) . Sc ■ 

 (STOR) Program 

 June 30, 1962. 



2. Tuna ecology. Ln M. Blackburn 

 rripps Tuna Oceanography Research 

 - Report for the year July 1, 1961- 

 Univ. Calif. Ref. 62-25:21-24. 



Distribution and abundance of tuna in the 

 Gulf of Tehuantepec. Yellowfin lagged zoo- 

 plankton by three months in the area. Yel- 

 lowfin were seasonal with interyear similari- 

 ties; skipjack were seasonal with large 

 interyear variance. 



KEY WORDS: tuna, yellowfin, skipjack, dis- 

 tribution, feed, season, temperature. 



Blackburn, M. 1963. Distribution and abundance of 

 tuna related to wind and ocean conditions in the 

 Gulf of Tehuantapec, Mexico. In H. Rosa (editor). 

 Proceedings of the world scientific meeting on the 

 biology of tunas and related species. La Jolla, 

 California, U.S.A., 2-14 July 1962, p. 1559-1582. 

 FAO Fish. Rep. 6. 



An hypothesis is stated wherein yellowfin are 

 more abundant in the Gulf of Tehuantapec area 

 and in seasons where and when they aggregate 

 upon the expected high concentrations of 

 their forage. (Eutrophication resulted from 

 wind mixing of the shallow pycnocline.) The 

 hypothesis was tested and confirmed when as- 

 sumptions were made of an average lag of 

 three months between wind action and the re- 

 sulting crop of forage. Yellowfin were dis- 

 tributed according to the distribution of 

 their food in space in time, and this distri- 

 bution could be understood in some detail by 

 reference to a series of oceanic phenomena 

 connected with the annual weather cycle. 



KEY WORDS: tuna, yellowfin, skipjack, dis- 

 tribution, abundance, oceanography, wind, 

 season, enrichment, circulation, feed. 



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